PNG ICO ICNS MORE
UI
Pixel
Fugue Icons
Circle, plus, frame
DarkSlateGray
16x16
tick, Circle, ok
cross, Circle
32x32
Circle, frame, cross
Minus, frame, Circle
Circle, frame, plus
tick, frame, Check
Computer & hardware
Smooth
Crystal Project
Circle, mini
cross, Circle, Error
3D
Crystal Clear
mini, Circle