apocalypse
area
bacterial
bio
biohazard
biological
biology
caution
chemicals
danger
dangerous
dead
death
devil
epidemic
evil
face
fatal
gas
harmful
hazard
hazardous
head
health
icon
infection
lab
label
mask
materials
pictogram
poison
radiation
radioactive
respirator
restricted
safety
sign
silhouette
skeleton
skull
stop
symbol
toxic
virus
warning
waste
zombie
zone