Science Laboratory Safety Signs

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Collection of Safety Symbols

Safety signs and symbols can help prevent accidents in the lab.
Safety signs and symbols can help prevent accidents in the lab. Ann Cutting / Getty Images

Science labs, particularly chemistry labs, have a lot of safety signs. This is a collection of public domain images you can use to learn what the different symbols mean or to construct signs for your own lab.

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Green Eyewash Sign or Symbol

Use this sign to indicate the location of an eyewash station.
Lab Safety Signs Use this sign to indicate the location of an eyewash station. Rafal Konieczny

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Green Safety Shower Sign or Symbol

This is the sign or symbol for a safety shower.
This is the sign or symbol for a safety shower. Epop, Creative Commons

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Green First Aid Sign

Use this symbol to identify the location of a first aid station.
Lab Safety Signs Use this symbol to identify the location of a first aid station. Rafal Konieczny

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Green Defibrillator Sign

This sign indicates the location of a defibrillator or AED.
This sign indicates the location of a defibrillator or AED. Stefan-Xp, Creative Commons

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Red Fire Blanket Safety Sign

This safety sign indicates the location of a fire blanket.
This safety sign indicates the location of a fire blanket. Epop, Creative Commons

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Radiation Symbol

Unofficial Radiation Symbol
Lab Safety Signs This radiation symbol is a little fancier than your standard trefoil, but it is easy to recognize the significance of the symbol. Ianare, Wikipedia Commons

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Black Biohazard Trefoil

This is the safety symbol for a biohazard.
This is the safety symbol for a biohazard. Silsor, Wikipedia Commons

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Triangular Radioactive Symbol - Safety Sign

This trefoil is the hazard symbol for radioactive material.
This trefoil is the hazard symbol for radioactive material. Cary Bass

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Red Ionizing Radiation Symbol - Safety Sign

This is the IAEA ionizing radiation warning symbol (ISO 21482).
This is the IAEA ionizing radiation warning symbol (ISO 21482). Kricke (Wikipedia) based on the IAEA symbol.

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Green Recycling Symbol

Universal recycling symbol or logo.
Lab Safety Signs Universal recycling symbol or logo. Cbuckley, Wikipedia Commons

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Skull and Crossbones - Safety Sign

Skull and Crossbones
Lab Safety Signs The skull and crossbones is used to indicate the presence of a toxic or poisonous material. Silsor, Wikipedia Commons

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Orange Toxic - Safety Sign

This is the hazard symbol for toxic substances.
This is the hazard symbol for toxic substances. European Chemicals Bureau

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Orange Harmful or Irritant Sign

This is the hazard symbol for an irritant or the general symbol for a potentially harmful chemical.
This is the hazard symbol for an irritant or the general symbol for a potentially harmful chemical. European Chemicals Bureau

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Orange Flammable - Safety Sign

This is the hazard symbol for flammable substances.
This is the hazard symbol for flammable substances. European Chemicals Bureau

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Orange Explosives - Safety Sign

This is the hazard symbol for explosives or an explosion hazard.
This is the hazard symbol for explosives or an explosion hazard. European Chemicals Bureau

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Orange Oxidizing - Safety Sign

This is the hazard symbol for oxidizing substances.
This is the hazard symbol for oxidizing substances. European Chemicals Bureau

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Orange Corrosive - Safety Sign

This is the hazard symbol indicating corrosive materials.
This is the hazard symbol indicating corrosive materials. European Chemicals Bureau

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Orange Environmental Hazard - Safety Sign

This is the safety sign indicating an environmental hazard.
This is the safety sign indicating an environmental hazard. European Chemicals Bureau

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Blue Respiratory Protection Sign - Safety Sign

This sign tells you respiratory protection is required.
Lab Safety Signs This sign tells you respiratory protection is required. Torsten Henning

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Blue Gloves Required Symbol - Safety Sign

This sign means you need to wear gloves or other hand protection.
Lab Safety Signs This sign means you need to wear gloves or other hand protection. Torsten Henning

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Blue Eye or Face Protection Symbol - Safety Sign

This symbol indicates mandatory eye or face protection.
Lab Safety Signs This symbol indicates mandatory eye or face protection. Torsten Henning

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Blue Protective Clothing Sign

This symbol indicates mandatory use of protective clothing.
Lab Safety Signs This symbol indicates mandatory use of protective clothing. Torsten Henning

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Blue Protective Footwear Sign

This sign indicates mandatory use of protective footwear.
Lab Safety Signs This sign indicates mandatory use of protective footwear. Torsten Henning

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Blue Eye Protection Required Sign

This sign or symbol means that proper eye protection must be worn.
This sign or symbol means that proper eye protection must be worn. Torsten Henning

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Blue Ear Protection Required Sign

This symbol or sign indicates ear protection is required.
This symbol or sign indicates ear protection is required. Torsten Henning

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Red and Black Danger Sign

Here is a blank danger sign that you can save or print.
Lab Safety Signs Here is a blank danger sign that you can save or print. RTCNCA, Wikipedia Creative Commons

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Yellow and Black Caution Sign

Here is a blank caution sign that you can save or print.
Lab Safety Signs Here is a blank caution sign that you can save or print. RTCNCA, Wikipedia Creative Commons

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Red and White Fire Extinguisher Sign

This symbol or sign indicates the location of a fire extinguisher.
Lab Safety Signs This symbol or sign indicates the location of a fire extinguisher. Moogle10000, Wikipedia Commons

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Black/White Fire Extinguisher

Here is a black and white fire extinguisher sign that you may save or print.
Lab Safety Signs Here is a black and white fire extinguisher sign that you may save or print. AIGA Public Domain Symbols

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Fire Hose Safety Sign

This safety sign indicates the location of a fire hose.
This safety sign indicates the location of a fire hose. Epop, Creative Commons

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Flammable Gas Symbol

This is the placard that indicates a flammable gas.
This is the placard that indicates a flammable gas. HAZMAT Class 2.1: Flammable Gas. Nickersonl, Wikipedia Commons

A flammable gas is one which will ignite on contact with an ignition source. Examples include hydrogen and acetylene.

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Nonflammable Gas

This is the hazard symbol for nonflammable gas.
This is the hazard symbol for nonflammable gas. Hazmat Class 2.2: Nonflammable Gas. Nonflammable gases are neither flammable nor poisonous. "Emergency Response Guidebook." U.S. Department of Transportation, 2004, pages 16-17.

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Chemical Weapon Symbol

U.S. Army symbol for chemical weapons.
Lab Safety Signs U.S. Army symbol for chemical weapons. U.S. Army

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Biological Weapon Symbol

This is the symbol for a biological weapon of mass destruction or biohazardous WMD.
Lab Safety Signs This is the US Army symbol for a biological weapon of mass destruction or biohazardous WMD. Andux, Wikipedia Commons. Design belongs to the US Army.

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Nuclear Weapon Symbol

This is the US Army symbol for a radiation WMD or nuclear weapon.
Lab Safety Signs This is the US Army symbol for a radiation WMD or nuclear weapon. Ysangkok, Wikipedia Commons. Design belongs to the US Army.

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International Biohazard Symbol

International Biohazard Symbol
Lab Safety Signs The WHO international biohazard symbol has a trefoil with blunt ends as opposed to the sharp ends usually seen in most biohazard symbols. Jenson, Wikipedia Commons

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Prohibition Symbol - Safety Sign

This is a generic prohibition sign or symbol.
Lab Safety Signs This is a generic prohibition sign or symbol. Torsten Henning

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Nonpotable Water Symbol - Safety Sign

Symbol for nonpotable water or no drinking water.
Lab Safety Signs Symbol for nonpotable water or no drinking water. Torsten Henning

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Do Not Touch Sign

This is a Do Not Touch or Do Not Grip sign.
Lab Safety Signs This is a Do Not Touch or Do Not Grip sign. Torsten Henning

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No Open Flames Sign

This sign prohibits flames and smoking.
Lab Safety Signs This sign prohibits flames and smoking. Torsten Henning

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Do Not Eat or Drink Sign

This is the prohibition sign for No Eating or Drinking.
Lab Safety Signs This is the prohibition sign for No Eating or Drinking. Torsten Henning

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Do Not Enter Sign

This sign prohibits entry or unauthorized entry.
Lab Safety Signs This sign prohibits entry or unauthorized entry. Torsten Henning

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Reactive Material Symbol

Symbol for a highly reactive material.
Lab Safety Signs This is the hazard symbol for WHMIS Class F hazardous material. It indicates a dangerously reactive material. Silsor, Wikipedia Commons

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Carcinogen Hazard Symbol

UN symbol for carcinogens and mutagens.
Lab Safety Signs This is the UN's Globally Harmonized System sign for carcinogens, mutagens, teratogens, respiratory sensitizers and substances with target organ toxicity. United Nations

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Low Temperature Warning Symbol

This symbol indicates the presence of a low temperature or cryogenic hazard.
Lab Safety Signs This symbol indicates the presence of a low temperature or cryogenic hazard. Torsten Henning

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Hot Surface Warning Symbol

This is a warning symbol indicating a hot surface, German standard DIN 4844-2.
Lab Safety Signs This is a warning symbol indicating a hot surface. Torsten Henning

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Magnetic Field Symbol

This is the warning symbol indicating the presence of a magnetic field.
Lab Safety Signs This is the warning symbol indicating the presence of a magnetic field. Torsten Henning

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Optical Radiation Symbol

This symbol indicates the presence of an optical radiation hazard.
Lab Safety Signs This symbol indicates the presence of an optical radiation hazard. Torsten Henning

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Laser Warning Sign

This symbol warns of the risk of exposure to laser light or coherent radiation.
Lab Safety Signs This symbol warns of the risk of exposure to laser beams or coherent radiation. Torsten Henning

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Compressed Gas Symbol

This symbol warns of the presence of compressed gas.
Lab Safety Signs This symbol warns of the presence of compressed gas. Torsten Henning

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Non-Ionizing Radiation Symbol

This is the warning symbol for non-ionizing radiation.
Lab Safety Signs This is the warning symbol for non-ionizing radiation. Torsten Henning

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Generic Warning Symbol

This is a generic warning symbol. You may save it or print it for use as a sign.
Lab Safety Signs This is a generic warning symbol. You may save it or print it for use as a sign. Torsten Henning

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Ionizing Radiation Symbol

The radiation symbol warning of an ionizing radiation hazard.
Lab Safety Signs The radiation symbol warning of an ionizing radiation hazard. Torsten Henning

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Remote Control Equipment

This sign warns of a hazard from remotely started equipment.
Lab Safety Signs This sign warns of a hazard from remotely started equipment. Torsten Henning

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Biohazard Sign

This sign warns of a biohazard.
Lab Safety Signs This sign warns of a biohazard. Bastique, Wikipedia Commons

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High Voltage Warning Sign

This symbol indicates the presence of a high voltage hazard.
Lab Safety Signs This symbol indicates the presence of a high voltage hazard. Duesentrieb, Wikipedia Commons

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Toxic Chemical Symbol

This symbol is for a material with 'other toxic effects'.
Lab Safety Signs This symbol is intended to warn of a WHMIS Class D-2 hazardous material, which is a material causing other toxic effects than those indicated by other signs. Silsor, Wikipedia Commons

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Laser Radiation Symbol

This sign warns of laser radiation.
Lab Safety Signs This sign warns of laser radiation. Spooky, Wikipedia Commons

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Blue Important Sign

Use this blue exclamation mark sign to indicate something important.
Lab Safety Signs Use this blue exclamation mark sign to indicate something important, but not dangerous. AzaToth, Wikipedia Commons

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Yellow Important Sign

Use this yellow exclamation mark sign to warn of something important.
Lab Safety Signs Use this yellow exclamation mark sign to warn of something important, which may present a hazard if ignored. Bastique, Wikipedia Commons

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Red Important Sign

Use this red exclamation mark sign to indicate something important.
Lab Safety Signs Use this red exclamation mark sign to indicate something important. Bastique, Wikipedia Commons

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Radioactive Symbol

Radioactive Symbol
Science Lab Safety Signs Radioactive Symbol. Architetto Francesco Rollandin, openclipart.org

This symbol indicates a radiation hazard.

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Radiation Warning Symbol

This symbol warns of a radiation hazard.
Lab Safety Signs This symbol warns of a radiation hazard. Silsor, Wikipedia Commons

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Poison Sign

Use this sign to indicate the presence of poisons.
Lab Safety Signs Use this sign to indicate the presence of poisons. W!B:, Wikipedia Commons

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Dangerous When Wet Sign

This sign indicates a material that presents a hazard when exposed to water.
Lab Safety Signs This sign indicates a material that presents a hazard when exposed to water. Mysid, Wikipedia Commons

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Orange Biohazard Sign

This sign warns of a biohazard or biological hazard.
Lab Safety Signs This sign warns of a biohazard or biological hazard. Marcin "Sei" Juchniewicz

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Recycling Sign

Recycling Sign
Science Lab Safety Signs Recycling Sign. A.J. Ashton, openclipart.org

You'll see the recycling symbol where materials are being stored which can be recycled.

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Chemistry Hazard Label

Chemistry Hazard Label
Science Lab Safety Signs Chemistry Hazard Label. Spencer Joplin, openclipart.org

The hazard label is found on chemical containers. It indicates health hazard, flammability, and other cautions associated with the chemical.

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No Open Flames

Open Flame Prohibited Sign
Science Lab Safety Signs Open Flame Prohibited Sign. Yves Guillou, openclipart.org

Be safe in the lab. Know the meanings of the safety signs.

If you see a No Open Flames sign, this usually implies there is a flammable or combustible material nearby.

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Toxic Materials Sign

Toxic Materials Sign
Science Lab Safety Signs Toxic Materials Sign. Yves Guillou, openclipart.org

This sign indicates the presence of a toxic or poisonous material.

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Explosive Material Sign

Explosive Material Sign
Science Lab Safety Signs Explosive Material Sign. Yves Guillou, openclipart.org

This symbol accompanies explosive materials.

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Flammable Sign

Flammable Sign
Science Lab Safety Signs Flammable Sign. Yves Guillou, openclipart.org

This is the symbol for a flammable substance, or one which can catch fire readily.

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Electrical Hazard Sign

Electrical Hazard Sign
Science Lab Safety Signs Electrical Hazard Sign. Yves Guillou, openclipart.org

Electrical Hazard Sign

This sign warns of live electricity.

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Biohazard Symbol

Biohazard Symbol
Science Lab Safety Signs Biohazard Symbol. Justin Warwick, openclipart.org

Laboratory safety begins with knowing the signficance of safety symbols.

This is the symbol for a biohazard, or a material which represents a threat to cellular materials or living organisms.

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Orange Combustible Materials Sign

Combustible Materials Sign
Science Lab Safety Signs Combustible Materials Sign. Yves Guillou, openclipart.org

Be safe in the lab. Know the meanings of the safety signs.

This sign warns of combustible materials.

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Orange Corrosive Materials Sign

Corrosive Materials Sign
Science Lab Safety Signs Corrosive Materials Sign. Yves Guillou, openclipart.org

Be safe in the lab. Learn the meanings of common safety signs.

Corrosive materials are usually strong acids or bases. They represent a hazard to your skin, and often to mucous membranes through inhalation of vapors. Pay attention to the proper storage container for corrosive materials. In addition, corrosive materials are reactive.

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Orange Flammable Symbol

Flammable Symbol
Science Lab Safety Signs Flammable Symbol. Yves Guillou, openclipart.org

Be safe in the lab. Know the significance of the safety signs.

Flammable materials are those which can catch fire readily.

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Orange Toxic Chemical Sign

Toxic Chemical Sign
Science Lab Safety Signs Toxic Chemical Sign. Yves Guillou, openclipart.org

Be safe in the lab. Know the significance of common safety signs.

This is the symbol for toxic or poisonous materials.

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Orange Environmental Hazard Sign

Environmental Hazard Sign
Lab Safety Signs Environmental Hazard Sign. Yves Guillou, openclipart.org

This is the symbol for a material which represents an environmental hazard.

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Red and Black Nonpotable Water Sign

Nonpotable Water Sign
Science Lab Safety Signs Nonpotable Water Sign. Yves Guillou, openclipart.org

Learning the significance of safety symbols will help you stay safe in the science lah.

The nonpotable water sign lets you know the water is not approved for drinking.

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Green Eyewash Sign

Eyewash Sign
Science Lab Safety Signs Eyewash Sign. Yves Guillou, openclipart.org

This sign is located at an eyewash station.

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Red Fire Extinguisher Sign

Fire Extinguisher Sign
Science Lab Safety Signs Fire Extinguisher Sign. Yves Guillou, openclipart.org

Be safe in the lab. Learn the significance of common safety signs.

The Fire Extinguisher sign should mark the position of.. you guessed it.. a functional fire extinguisher.

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Green Recycling Symbol

The green Mobius strip with arrows is the universal recycling symbol.
Lab Safety Signs The green Mobius strip with arrows is the universal recycling symbol. Antaya, Wikipedia Commons

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Yellow Radioactive Diamond Sign

This sign warns of a radiation hazard.
Lab Safety Signs This sign warns of a radiation hazard. rfc1394, Wikipedia Commons

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Black/White Corrosive Diamond Sign

This sign warns of corrosive chemicals.
Lab Safety Signs This sign warns of corrosive chemicals. Amada44, Wikipedia Commons

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Green Mr Yuk

Mr. Yuk means no!
Safety Symbols Mr. Yuk means no!. Children's Hospital of Pittsburgh

Mr. Yuk is a hazard symbol used in the US that is intended to warn young children of poison.

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Original Magenta Radiation Symbol

The original radiation warning symbol was devised in 1946 at the Berkeley Radiation Laboratory.
Safety Symbols The original radiation warning symbol was devised in 1946 at the University of California, Berkeley Radiation Laboratory. Unlike the modern black on yellow symbol, the original radiation symbol featured a magenta trefoil on a blue background. Gavin C. Stewart, Public Domain

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Red and White Fire Extinguisher Sign

This safety sign indicates the location of a fire extinguisher.
This safety sign indicates the location of a fire extinguisher. Epop, Creative Commons

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Red Emergency Call Button Sign

This sign indicates the location of an emergency call button, usually used in case of a fire.
This sign indicates the location of an emergency call button, usually used in case of a fire. Epop, Wikipedia Commons

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Green Emergency Assembly or Evacuation Point Sign

This sign indicates the emergency assembly point or emergency evacuation location.
This sign indicates the emergency assembly location or emergency evacuation location. Epop, Creative Commons

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Green Escape Route Sign

This sign indicates the direction of the emergency escape route or emergency exit.
This sign indicates the direction of the emergency escape route or emergency exit. Tobias K., Creative Commons License

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Green Radura Symbol

The radura symbol is used to identify food that has been irradiated food in USA.
The radura symbol is used to identify food that has been irradiated food in USA. USDA

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Red and Yellow High Voltage Sign

This sign warns of a high voltage hazard.
This sign warns of a high voltage hazard. BipinSankar, Wikipedia Public Domain

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US Army Symbols of WMD

These are the symbols used by the US Army to signify weapons of mass destruction (WMD).
These are the symbols used by the US Army to signify weapons of mass destruction (WMD). The symbols are not necessarily consistent from one country to another. Wikimedia Commons, Creative Commons License

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NFPA 704 Placard or Sign

This is an example of a NFPA 704 warning sign.
This is an example of a NFPA 704 warning sign. The four colored quadrants of the sign indicate the types of hazards presented by a material. public domain