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Signs & symbols
Smooth
Super Mono Basic
Basic, Blue, Balloon
Black
48x48
frame, Basic, question
DeepSkyBlue
Business & finance
Pretty Office Icon Set Part 6
true, type, false
DarkSlateGray
256x256
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Files & folders
Spirit20
system, 02, question
SteelBlue
20x20
question, system
CornflowerBlue
Free pretty office Icons part 2
Faq, Answer, question
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UI
MicrOS
Info, question, support
64x64
Bloggers Vol 1-7
question
Chocolate
512x512
Mixed
Addictive Flavour
Super, question, mario
DarkGoldenrod
Matte set: Basic
question, help
32x32
Arrows
Minimal perception
Dialog, question
DarkGray
Desktop apps
3D Cartoons III
help, robohelp, question mark
128x128
help, Faq, robohelp
Shopping & e-commerce
Woothemes Ultimate Icon Set
exclamation, stop, Hand
KDE Crystal Diamond
question, messagebox
22x22