History and Flag
The first pan-pan-pan imagery was a stamp made by DeviantArt user GeekyCorn on May 13, 2020. The stamp has a pangender flag in a triangle shape on the top row and a panromantic and pansexual in triangle shapes on the bottom row.
The current term and flag were created by a FANDOM user going by the name Arwen on October 24, 2020. The flag is also inspired by the pansexual, panromantic, and pangender flags.