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UI
Glyph
Freecns Cumulus
Gibbous, Moon
Black
512x512
Cloud, Moon, snowflake
Moon, Cloud, lightning
Moon, Cloud, raindrop
Cloud, snowflake, Moon
Cloud, Moon, Fog
Moon, Cloud
Cloud, Moon, Snow
Moon, Cloud, Rain
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
galaxy, meteor, planets
64x64
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Halloween
Photorealistic
Desktop Halloween
Female, night, Cloudy
256x256
Computer & hardware
Ionicons
Moon
Mixed
WPZOOM Developer Icon Set
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Mobile apps
Free Retina Icon Set
Moon, web, Calendar
60x60
Photography & graphic design
3D
32x32 Free Design Icons
quarter, half, lunar
32x32
Business & finance
48x48 Free Time Icons
Moon, lunar, Calendar
48x48
Pittogrammi
Moon, night, Cloud
Windows 8 metro style
Outline
Eightyshades
Music & multimedia
Othericons
Weather
Meteocons
Fog, Moon