abstract
alert
attention
badge
blazon
bone
caution
chemical
chemistry
danger
dangerous
dead
death
design
dirty
emblem
face
gothic
grunge
hazardous
head
horror
human
icon
insignia
isolated
logo
nuclear
nuke
radiation
radioactive
radioactivity
sign
skeleton
skull
stencil
symbol
tattoo
texture
toxic
toxicity
warn
warning
yellow
zone