This open source icon is named "companion cube" and is licensed under the open source CC BY 3.0 license. It's available to be downloaded in SVG and PNG formats (available in 256, 512, 1024 and 2048 PNG sizes).
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225 companion cube Icons & Illustrations – Iconduck
Companion cube icon, SVG and PNG
Video, game, logo, companion, cube icon - Download on Iconfinder
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Portal Original Companion Cube Key Cap – Shadow Anime
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companion cube Icon - Download for free – Iconduck
cube Icon - Download for free – Iconduck
225 companion cube Icons & Illustrations – Iconduck
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