Official site of mustache
A mustache (or moustache) is facial hair grown above the upper lip. It may or may not be accompanied by a beard.
The word "moustache" derives from 16th century French moustache, which in turn is derived from the Italian mostaccio, from Medieval Latin mustacium (8th century), Medieval Greek moustakion (attested in the 9th century), which ultimately originates as a diminutive of Hellenistic Greek mustax (mustak-) "moustache", probably derived from Hellenistic Greek mullon "lip".1
Mustaches are a sign of intense masculinity, as exhibited by the likes of Old Snake, Luigi, Freddy Mercury, President William Howard Taft, Robert Goulet, and Hironobu Sakaguchi.