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This is a paid asset, but now you can download Icons Pack – Prehistoric – 50pk Free.
Detail this asset from Unity Store: Original Link
Icons Pack – Prehistoric – 50pk v1.01
An icon pack containing 50 icons at 512*512 pixels including border, backplate and effects layers.
A UI canvas has been created as a starting point.
Request icons and borders or backplates to be added in the next update