What is "fish-fin"

"Fish-Fin" is a designation or nickname given by Mayanist epigraphers (inscription scholars) to a personage whose undeciphered name- glyph appears in the epigraphic record in association with the Emblem glyph of Bonampak, a pre-Columbian Maya civilization site in present-day Chiapas, Mexico.

This individual, identified as a ruler of the Bonampak polity or government, is mentioned in the Maya inscriptions at Yaxchilan, another Maya site located some 30 km to the north of Bonampak.