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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
Demo Professional Toolbar Icons
by, All, Keep
48x48
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Information, Communication, clue
Mixed
I like buttons
perspective, button, Info
128x128
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Free Applications Icons
question, Info, Information
24x24
mark, query, support
Info, mark, about
hint, Info, q and a