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Signs & symbols
Glyph
Miscellany Web icons
math, calculation, mathematics
Black
475x512
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Mixed
Free Misc Icon Set 1
Device, math, calculator
512x512
Business & finance
Math & Business
stop, Minus, math
506x512
sign, Character, math
Character, sign, increase
multiple, Character, math
=, Character, math
math, sign, Character
sign, math, Character
Character, sign, math
question, sign, Character
Face, math, Character
UI
Very Basic. Android L (Lollipop)
Minus, math, remove
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Free Mobile Icon Kit
math
64x64