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Business & finance
Glyph
Font Awesome
question, Circle
Black
512x512
question
PNG SVG MORE
Math & Business
question, sign, Character
506x512
Answer, mark, Ask
PNG ICO ICNS MORE
48x48 Free Time Icons
party, Holiday, Balloon
48x48
PNG MORE
24x24 Free Application Icons
question, about, Book
DodgerBlue
24x24
mark, help, interrogatory
WhiteSmoke
talk, Bubble, support
support, mark, question
SteelBlue
mark, about, help