Symbol on early Apple operating systems / From Wikipedia, the free encyclopedia

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The dogcow, named Clarus, is a bitmapped image designed by Apple for the demonstration of page layout in the classic Mac OS. The sound she makes is "Moof!", a portmanteau of "moo" and "woof".[1] Clarus became the archetype of surrealistic humor in the corporate culture of the original Macintosh group, particularly as the mascot of Apple’s Developer Technical Support as officially documented in Technote #31.[1][2]

Clarus the Dogcow