acknowledge
app
back
background
bye
clip art
clipart
communication
emoji
finger
fingers
flap
flat
forth
gesture
gesturing
good
goodbye
graphic
greet
greetings
hail
hand
hello
hey
hi
howdy
human
icon
illustration
isolated
language
line
movement
moving
nonverbal
online
outline
palm
pictogram
prehensile
shake
sign
signal
silhouette
symbol
wave
web
website