Apollonian is a term used to describe a person who presents themselves in a masculine way, but does not identify as a person of male/masculine gender.
The term can be used by anyone whose gender is not inherently masculine. The feminine counterpart is artemesian.
History
The term and flag were created in a story pin by Pinterest user emozemo on July 19th, 2021. She also created the artemesian term and flag in the same post.