teuctli (Mdz55r)
This is a glyphic element that represents teuctli or tecuhtli (two spellings for high noble, lord). It is a profile view (facing right) of a turquoise diadem or crown (the xiuhhuitzolli) with a red (probably leather) tie that goes around the back of the head.
Stephanie Wood
This turquoise diadem was actually called the xiuhhuitzolli (spelled variously) or xiuhtzontli, but it was a symbol for the position of teuctli (also spelled tecuhtli), for it was worn by high nobles who were leaders and residents of a teccalli (lordly house). Thus, the diadem is a logogram, and does not provide a phonetic reading. The red tie, possibly made of dyed leather, has a knot that is shaped much like the one on the maxtlatl) (loincloth).
Stephanie Wood
by 1553 at the latest
lords, señores, diademas, diadems, coronas, crowns, teuctli

teuc(tli), lord, high noble, https://nahuatl.wired-humanities.org/content/teuctli
xiuhhuitzo(li), turquoise diadem, https://nahuatl.wired-humanities.org/content/xiuhhuitzolli
lord
señor
Stephanie Wood
Codex Mendoza, folio 55 recto, https://codicemendoza.inah.gob.mx/inicio.php?lang=english
The Bodleian Libraries, University of Oxford, hold the original manuscript, the MS. Arch. Selden. A. 1. This image is published here under the UK Creative Commons, “Attribution-NonCommercial-ShareAlike 3.0 License” (CC-BY-NC-SA 3.0).