something bent, twisted ("col" seems to be a root for many terms with this meaning, although colli usually translates as grandfather, grandparents, forebears, or ancestors)
See an image that represents colli from the simplex glyph Cocol in the Visual Lexicon of Aztec Hieroglyphs, ed. Stephanie Wood (Eugene, Ore.: Wired Humanities, 2020-present).
cōlli = "Lit., that which is bent, crooked, or twisted (see cōltic)."
"The curved mountain references Culhuacan phonetically and ideographically. The curvature of the mountain's peak evokes the Nahuatl root 'col,' something twisted,' and its derivatives: for example, 'colihui,' to bend'; 'coloa,' 'to bend or twist something'; or 'colli,' something 'bent or twisted.'"