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Signs & symbols
Flat
Circle Icons
recycle, recycling
Gainsboro
512x512
UI
Outline
ikooni outline: Free Basic
delete, remove, recycling
Black
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Glyph
Windows 8 metro style
recycling
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
hand-drawn, recycle, environment
64x64
Mobile apps
Squareplex
recycling, Empty, Bin
ForestGreen
Full, recycling, Bin
Computer & hardware
3D
Discovery
recycling, Bin, trash can
DimGray
32x32
waste, Bin, recycling