the name of a ruler of Tenochtitlan; baptized as don Diego de San Francisco Tehuetzquititzin
As published in Wikipedia, this ruler's personal name glyph in the Codex Aubin shows a smiling mouth with fangs. See: https://en.wikipedia.org/wiki/Diego_de_San_Francisco_Tehuetzquititzin#/m.... A very similar glyph appears in a copy made by Karl H. Berendt (copyist)and scanned by the Mesoamerican Language Texts Digitization Project. This second one appears in Wikipédia, https://pt.wikipedia.org/wiki/Diego_de_San_Francisco_Tehuetzquititzin. Finally, a similar mouth appears in two glyphs in the Visual Lexicon of Aztec Hieroglyphs under the title Huetzquiz. These come from the Matrícula de Huexotzinco ff. 529r and 666r.