care
concert
conductor
construction worker
courier
danger
delivery
doctor
electrician
element
energy
engineer
firefighter
flat
health
helmet
hospital
house
icon
industry
judge
key workers
law
legal
line
linear
man
medical
outline
pack
pharmacist
pilot
plane
postman
research
safety
scientific
scientist
seminar
set
sign
soldier
stroke
symbol
teacher
thin
training
worker