MtT
Male-to-Trans. A feminist revision of the more commonly known "MtF" (male-to-female). Meant to clarify that even if a trans-identified adult human male person changes appearance through hormones or surgery to align with a personal feeling of gender, the sex of the individual can never actually be changed to female (the physical change is only "skin deep").
I quit using the Orwellian term "MtF"; MtT is more accurate and neutral.