cocharacter

From co- +‎ character.

cocharacter (plural cocharacters)

1. (mathematics) The dual notion to a character; a group homomorphism from the group of units of a field.
   • 2015, Ana Caraiani, Brandon Levin, “Kisin modules with descent data and parahoric local models”, in arXiv‎^[1]:

     We show that this space is smoothly equivalent to the local model for ${\displaystyle \mathrm {Res} _{K/\mathbb {Q} _{p}}\mathrm {GL} _{n}}$, cocharacter ${\displaystyle \{\mu \}}$, and parahoric level structure.