Warning symbols are mainly graphic images which identify a dangerous object or place. Warning symbols are used in many places in lieu of or addition to written warnings as they are quickly recognized (faster than reading a written warning) and more universally understood (the same symbol can be recognized as having the same meaning to speakers of different languages).

List of warning symbols

• General warning symbol -
• Twisty road symbol -
• Accident symbol -
• Disabled car symbol -
• Icy road symbol -
• Fragile symbol (fragile contents).
• Mr. Yuk
  Mr. Yuk
  Mr. Yuk is a trademarked graphic image, created by the Children's Hospital of Pittsburgh, and widely employed in the United States in labeling of substances that are poisonous if ingested.-Overview:...
  
   (poison, designed for children).
• Ionizing radiation
  Ionizing radiation
  Ionizing radiation is radiation composed of particles that individually have sufficient energy to remove an electron from an atom or molecule. This ionization produces free radicals, which are atoms or molecules containing unpaired electrons...
  
   (radiation) -
• Skull and crossbones - (general danger, poison).
• Biological hazard
  Biological hazard
  Biological hazards, refer to biological substances that pose a threat to the health of living organisms, primarily that of humans. This can include medical waste or samples of a microorganism, virus or toxin that can impact human health. It can also include substances harmful to animals...
  
   symbol - (biological waste, live bacteria/viruses, etc.).
• Explosive material
  Explosive material
  An explosive material, also called an explosive, is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure...
  
   symbol (explosives).
• Corrosive
  Corrosive
  A corrosive substance is one that will destroy or irreversibly damage another surface or substance with which it comes into contact. The main hazards to people include damage to the eyes, the skin, and the tissue under the skin; inhalation or ingestion of a corrosive substance can damage the...
  
   material symbol (corrosive substances e.g. acids, bases, phenols, etc.).
• Chemical hazard label (general safety symbol for lab chemicals).
• High Voltage
  Voltage
  Voltage, otherwise known as electrical potential difference or electric tension is the difference in electric potential between two points — or the difference in electric potential energy per unit charge between two points...
  
   symbol - (high voltage).
• Laser safety
  Laser safety
  Laser safety is safe design, use and implementation of lasers to minimize the risk of laser accidents, especially those involving eye injuries. Since even relatively small amounts of laser light can lead to permanent eye injuries, the sale and usage of lasers is typically subject to government...
  
  symbol (laser radiation).
• Keep away from heat (temperature sensitive contents).