We currently have a tag geometrical-isomerism.
The IUPAC Gold Book defines this (DOI: 10.1351/goldbook.G02620):
geometric isomerism [obsolete]
Obsolete synonym for cis-trans isomerism. (Usage strongly discouraged).
I know that the term is still very, very popular in some textbooks; however, I think we should follow the IUPAC recommendation and rename the tag. I don't think there is much need for debate, but there is a question remaining: Should we keep a synonym?