accident

alarm

alert

attention

background

blink

blinking

breakdown

caution

collapse

computer

control

crash

danger

dangerous

disaster

electronics

emergency

equipment

error

failure

fire

flash

flashing

future

hazard

illumination

indicator

it

lamps

light

modern

notify

nuclear

problem

protection

red

risk

safety

security

signal

siren

situation

smart

system

technology

urgency

urgent

warn

warning