PNG ICO ICNS MORE
Computer & hardware
3D
Pandora
no, Cover
DarkSlateGray
128x128
Network & communications
BeOS
halo, no, beos
Black
Mixed
The Spherical icon set
smoking, no, no smoking
Maroon
UI
Outline
UIDesign Icons
no, gui, Checkbox
Gray
16x16
no, Checkbox
WhiteSmoke
sound, no
no, radiobutton
Signs & symbols
Must Have
Close, no, reject
Firebrick
256x256
Pixel
Exit, Close, Dialog
DarkRed
22x22
Discovery
Connect, no
32x32
Arrows
Smooth
Minimal perception
64x64
PNG MORE
Desktop apps
Free Applications Icons
remove, delete, reject
Crimson
24x24
reject, no, wrong
delete, no, Cancelled
no entry, restricted, forbidden
Red
Minus, forbid, restrict
no entry, unable, Exit
Gnome icons
Duplex, no, Print
48x48
Iconza
no
Crystal Project
Goldenrod
BWPX
Gainsboro
18x18
Shopping & e-commerce
Woothemes Ultimate Icon Set
Entry, no
Tomato
no, Connect
Photography & graphic design
Dark Glass
Exit, delete, remove
SlateGray