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Desktop apps
3D
Free Social Media Icons
speech, about, Bubble
DodgerBlue
512x512
Signs & symbols
Free 3d Glossy Interface Icon Set
about, question, support
64x64
Info, Information, sign
Mixed
Momentum Glossy icons
Information
32x32
Demo Professional Toolbar Icons
by, All, Keep
48x48
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Information, Communication, clue
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Free Applications Icons
question, Info, Information
24x24
mark, query, support
hint, Info, q and a