a design found on some war shields; see an article about it, with illustrations, in Arqueología Mexicana, https://arqueologiamexicana.mx/mexico-antiguo/el-cuexyo-chimalli-del-cas..., and see examples from the Codex Mendoza and other manuscripts in our online Visual Lexicon of Aztec Hieroglyphs
The shield is a chimalli, and the design of this one is called cuexyo by Berdan and Anawalt (The Codex Mendoza, 1992, vol. 1, Appendix G). It is made from a painted animal skin and decorated with feathers. One wonders if it has an association with the cuextecatl, a dancer.
"En la primera carta de Relación, Hernán Cortés menciona el envío de: 'Una rodela grande de plumas y de un cuero de un animal pintado [con manchas], y en el campo rodean en el medio una chapa de oro, con cuatro otras chapas'." [ver el artículo citado arriba]