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The Spherical
Molecule
MidnightBlue
128x128
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Healthcare & medical
Flat
Medical Elements
Black
512x512
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Mixed
Glyph
Free Misc Icon Set 1
Molecule, science, Chemistry
Signs & symbols
Circle Icons
Molecule, Atom
SandyBrown
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Molecule, science, Social
64x64
Desktop apps
Smooth
Farm-fresh
32x32
3D
The Spherical icon set