PNG ICO MORE
24x24 Free Application
forbidden
Red
24x24
PNG MORE
Business & finance
Glyph
24x24 Free Application Icons
Minus, Closed, glossy
stop, no access, remove
PNG ICO ICNS MORE
Network & communications
Pixel
16x16 Free Application Icons
16x16
Minus, sign, forbid
Desktop apps
3D
Free Applications Icons
no entry, restricted, forbidden
Minus, forbid, restrict
UI
Crystal Clear
forbidden, cancel
48x48