"FtM" stands for "Female to Male." This designation refers to people who were born female but identify as male. Another way to call these individuals is "transmen." They may take various steps, such as taking hormones or surgery, to make their appearance and body more in line with how they feel inside. It's part of the process of helping them live in harmony with how they feel about themselves.
FtM (Female to Male): The Sexiom Handbook
Definition and designation of the term FtM (Female to Male) from the Sexiom Handbook. Quick and briefly.