abstract
ball
button
color
concept
design
disease
emoticon
emotion
expression
face
feedback
green
happy
health
icon
illness
label
level
like
linear
measurement
moderate
negative
neutral
ok
opinion
orange
pain
physical
positive
rate
rating
reaction
red
round
sad
scale
set
sign
smile
smiley
stress
symbol
text
unlike
web
website
worst
yellow