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letters and numbers
Letter, red, Alphabet
Black
512x512
y, Letter, Alphabet
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Social media
Glyph
Social Glyph
y, yahoo
480x480
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Formula, hand drawn, square root
64x64
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Touch gestures
Outline
Open Source Gesture Library
Letter, Gestureworks, Lowercase
uppercase, stroke, y
UI
Pixel
Gnome icons
offset, y, fontwork
16x16