Combinations of glyphs on the halos of the frontal faces shown on the bottom register of the frieze decorating the Portada del Sol. Drawing by Carlos Herrera.
Isbell, William H.; Uribe, Mauricio I.; Tiballi, Anne; Edward P. Zegarra, 2018, "Visual database", https://doi.org/10.25346/S6/1B33FN.