my left hand (see Molina); the first part is matl (also spelled maitl) with the first person possessive pronoun
Alonso de Molina:
noma opoch. mi mano yzquierda. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 73r. col. 1. Thanks to Joe Campbell for providing the transcription.