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:
Groupsubgroup relationship D. en Direct groupsubgroup relationship in the threedimensional crystallographic point groups fr Relations directes de groupe dans les groupes ponctuels de symtrie cristallographiques tridimensionnels de Direkte GruppeUntergruppeBeziehungen in den dreidimensionalen kristallographischen Punktgruppen own