This report demonstrates recourse to homophony in ancient Maya script, illustrating the generalization of signs on the basis of their phonetic values, apart from their primary semantic values. It focuses on substitutions, in eight glyphic contexts, of signs for “sky,” the number “four,” and “snake,” the words for which are homophonous or nearly homophonous in most Mayan languages. A final, unique glyphic context exhibits the use of homophony in a spelling of Kukulcan's name from the classic period.