This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Tetrahedron family symmetries. en October en chart of tetrahedra with various symmetries created this work entirely by myself br from org en SockPuppetForTomruen talk en SockPuppetForTomruen Original upload log page en Tetrahedronfamilysymmetries SockPuppetForTomruen bytes no chart of tetrahedra with various symmetries