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UI
Pixel
Fugue Icons
question, frame, octagon
RoyalBlue
16x16
question, octagon
White, question
question, White
question, Silhouette, user
DarkSlateGray
Network & communications
Cartoon
Sticky pack
question
Khaki
128x128
Business & finance
Smooth
Free pretty office Icons part 2
Faq, Answer, question
Black
256x256
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MicrOS
Info, question, support
SteelBlue
64x64
Bloggers Vol 1-7
Chocolate
512x512
Mixed
Addictive Flavour
Super, question, mario
DarkGoldenrod
48x48
Desktop apps
Sizicons
Blue, question
Gray
Matte set: Basic
question, help
32x32
Gloss set: Basic
question, Faq, about
DodgerBlue
Gaming & gambling
Super Mario
question, mario
Gold
coin, question
question, retro, Block
question, Block, retro
SandyBrown
retro, question, Cloud
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Files & folders
ExplodingBoy Pixel Icons
PowderBlue
20x20
Family & home
Shrunk Pidgin Smilies
24x24
Handdrawn
Web Design Creatives
mark, question
3D
The Spherical icon set
Ask, question, help
MidnightBlue
frame, about, question
question, shield