nahuallachtli.

a type of ball court, apparently having something to do with nahualli, the shape-shifting spirit, and having a significance relating to Tlaloc, the rain deity (sixteenth century, Quauhtinchan)
Historia Tolteca-Chichimeca, eds. Paul Kirchhoff, Lina Odena Güemes, y Luis Reyes García (México: CISINAH, INAH-SEP, 1976), 172 and note 3.