21 Hazard Symbols Warning Standard

**Hazard symbols or warning symbols**
- Skull and crossbones, a common symbol for poison and other sources of lethal danger (GHS hazard pictograms)
- Generic caution
- Poison
- Ionizing radiation
- Radiation – high-level source
- Non-ionizing radiation
- Biological hazard
- Carcinogen
- High voltage
- Laser hazard
- German road warning symbol
- ISO 21482 high-level sealed-source ionizing radiation symbol
- International ionizing radiation trefoil symbol
- Yellow and magenta ionizing radiation trefoil used in the US
- Early ionizing radiation symbol (1946)
- Biohazard symbol used since 1966
- Obsolete German symbol (Warnung vor feuergefaerhlichen Stoffen,Symbol D-W001 nach DIN 4844-2)
- The hazard symbol for flammable/highly flammable substances according to directive 67/548/EWG by the European Chemicals Bureau
- Globally Harmonized System of Classification and Labelling of Chemicals (GHS) pictogram for flammable substances
- DR European hazard sign, meaning "highly flammable" (33)—"gasoline" (1203)
- The US-based National Fire Protection Association standard hazard sticker
- Workplace Hazardous Materials Information System
- Mr. Ouch is a hazard symbol developed by the National Electrical Manufacturers Association (NEMA) to represent electrical hazards. Unlike other high-voltage warning symbols
- Mr. Yuk is a trademarked graphic image, created by UPMC Children's Hospital of Pittsburgh, and widely employed in the United States in labeling of substances that are poisonous if ingested