Coacuechtli (MH569v)

This black-line drawing of the compound glyph for the personal name for Coacuechtli ["Serpent-Shell," attested here as a man's name) possibly shows a serpent (coatl) coiled around a post (the spiral is implicit, seemingly). The look, however, is also reminiscent of an upright shell (cuechtli). Another example of a cuechtli has curving lines that, if stood upright, could look like these coils. Usually, with alphabetic compounds, the first part modifies the second, so the result would be a coiled-serpent-like shell.