Graffiti it is a rapidly developing art form whose value is highly contested and reviled by many authorities while also subject to protection, sometimes within the same jurisdiction. Both "graffiti" and its occasional singular form "graffito" are from the Italian word "graffiato" ("scratched"). "Graffiti" is applied in art history to works of art produced by scratching a design into a surface. A related term is "sgraffito", which involves scratching through one layer of pigment to reveal another beneath it. This technique was primarily used by potters who would glaze their wares and then scratch a design into it. In ancient times
Plural form of words ending in -us follows standard Latin rules for pluralization and becomes "cacti", which has become the prevalent usage in English. Regardless, "cactus" is popularly used as both singular and plural, and is cited as both singular and plural. "Cactuses" is also an acceptable plural in English. Facetious mock-erudite plurals in "-i" or even "-ii" are sometimes found for words ending with a sound (vaguely) similar to "-us". Examples are "stewardi" (supposed plural of "stewardess") and "Elvi" (as a plural for "Elvis" imitators). The Toyota corporation has determined that their "Prius" model should have the plural form "Prii", even though the Latin word "prius"