angle
architecture
art
artwork
black
centimeter
construction
design
drawing
education
element
equipment
flat
geometric
geometry
green
icon
illustration
inch
industry
instrument
isolated
length
mathematical
mathematics
measure
measurement
metal
metric
millimeter
object
office
painting
plastic
ruler
school
science
set
sign
single
straight
straightedge
student
symbol
technical
tool
triangle
yardstick
yellow