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Signs
Flat
Entypo
signs, question, Inquiry
Black
512x512
signs, Ask, Doubt
Interface
Education
speech, Doubt, question
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Business & finance
Glyph
Math & Business
Answer, mark, Ask
506x512
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Social media
3D
Sweet Social Media
Social, Ask, media
Mixed
Simple Icons
Ask, what, question
Network & communications
Iconico
Headphones, Chat, Ask
1024x1024
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iOS7 optimized
Outline
Social Media
question, Ask, Grid
search-engine, web-technology, question
Desktop apps
Smooth
Farm-fresh
Answer, Ask, And
32x32
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Handdrawn
Chat, talk, Ask
128x128