attention
beware
bio
biohazard
biologic
biological
black
bomb
caution
chemical
chemistry
crossbones
danger
dangerous
death
education
electric
experiment
hazard
health
icon
illustration
isolated
lab
label
medical
medicine
notice
nuclear
organic
power
protection
radiation
radioactive
risk
safety
security
set
sign
skull
substance
symbol
toxic
triangle
virus
warning
waste
yellow
zone