area
attention
bacteria
bio
biohazard
biologic
biological
biology
blue
caution
chemical
danger
dangerous
environment
epidemic
experiment
forbidden
frame
hazard
hazardous
icon
illustration
lab
laboratory
medical
medicine
protect
protection
research
risk
safety
science
scientific
security
sign
signal
single
stencil
substance
symbol
toxic
virus
warning
waste
yellow
zone