abstract
air
airplane
army
background
bolt
circle
computer
control
danger
defense
detect
device
digital
display
equipment
green
icon
industry
map
metal
military
monitor
navigation
object
pattern
point
positioning
protection
radar
radio
safety
scan
scanning
screen
search
searching
signal
silhouette
sonar
submarine
symbol
system
target
technology
traffic
visual
war
weapon