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.
the language of the sorcerers Maarten E. R. G. N. Jansen, "Las lenguas divinas del México precolonial," Boletín de Estudios Latinoamericanos y del Caribe, 38 (1985), 3–14; see page 6.
a sorcerer; a shape-changer; a spirit, often an animal form or shape a person could take on (see Karttunen; Molina gives "witch"); hieroglyphs show it attached to the crown of the human head; see for example, Nahualecaxoc (MH904v) and Nahual (MH879v)
The root nahual- "means to transform, convert, transfigure, disguise, re-clothe, mask oneself, conceal, camouflage, and finally to trick." Katarzyna Mikulska Dabrowska, "'Secret Language' in Oral and Graphic Form: Religious-Magic Discourse in Aztec Speeches and Manuscripts," Oral Tradition 25:3 (2010), 325–363, see page 327.