A Mexican Spanish convention is to spell certain indigenous words with rather than the that would be the standard spelling in Spanish. This is generally due to the origin of the word (or the present pronunciation) containing the voiceless postalveolar fricative sound or another sibilant that is not used in modern standard Spanish. The most noticeable word with this feature is "México" (see Toponymy of Mexico). The Real Academia Española recommends this spelling. The American Spanish colloquial term "chicano" is shortened from "mechicano", which uses in place of the of rural Mexican Spanish .