a figure with three angles or three corners (see Molina)
Orthographic Variants:
yexcampa nacace machiotl
Alonso de Molina:
yexcampa nacace machiotl. figura de tres angulos, o esquinas. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 36r. col. 2. Thanks to Joe Campbell for providing the transcription.