PNG MORE
Business & finance
Pixel
24x24 Free Pixel Icons
push, update, Go
Black
24x24
PNG ICO ICNS MORE
Network & communications
16x16 Free Application Icons
Arrow, Go, Up
DodgerBlue
16x16
Arrow, Go, push
upload, update, Go
Desktop apps
Sizicons
refresh, update
DarkSlateGray
UI
Gnome icons
styles, update
Fields, update
WhiteSmoke
Files & folders
Still life
manager, update
48x48
Data, update
Entry, Navigator, update
Tango
update, software, system
32x32
software, Available, update
Chocolate
Attention, update, software
DarkRed
Fugue Icons
refresh, update, renew
SteelBlue