FtF flag
Female-to-Female or Female to Female (FtF or FTF or F2F) is a term for trans women who consider themselves to be transitioning from Female to Female. One was AMAB, but reject the idea that their gender was ever Male. One may consider themselves to have always been Female, but not in the way that Female is traditionally defined.
Some may prefer this over the term MtF, or male-to-female.