abstract
always
binary
black
boundless
business
circle
concept
contemporary
creative
cycle
design
double
dual
duple
duplicate
eight
element
emblem
endless
eternity
geometric
graphic
icon
idea
illustration
infinite
infinity
isolated
knot
limit
limitles
line
logo
loop
mark
modern
moebius
motion
philosophy
round
shape
sign
style
symbol
tattoo
twain
twin
twofold