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a bone with lines carved across it that, when scraped, produced a sound; a percussion instrument (see attestations)
The Museo del Templo Mayor has a stone sculpture of an omichicahuaztli with an attached turbinate shell that may have been used to do the scraping. The museum at Tlatelolco has an actual bone with these markings. (SW)
The Visual Lexicon of Aztec Hieroglyphs has an omichicahuaztli that is a hieroglyph for the personal name Tomichicahuaz. See: https://aztecglyphs.wired-humanities.org/content/tomichicahuaz-mh904v Photos of the two museum pieces will soon appear o that same webpage in the Visual Lexicon. (SW)