Skull and Crossbones
Universal symbol for poison, toxic substances, and mortal danger.
International · c. 1400 CE – present
High Voltage Warning
Warning symbol indicating the presence of high-voltage electrical hazards.
Description
The high voltage warning symbol consists of a yellow equilateral triangle containing a black lightning bolt (chevron). It is standardized by ISO 7010 as warning sign W012 and by IEC 60417 as symbol 5036. The symbol warns of the presence of high-voltage electrical equipment or conductors that pose a risk of electric shock or electrocution. It is used on electrical panels, transformers, power lines, and equipment where contact with live parts could be fatal.
Origin & Cultural Context
Standardized by ISO 7010 (W012) and IEC 60417 (symbol 5036). The lightning bolt as a symbol for electricity dates to the 18th century.