(derogatory) Synonym of wumao: A member of the 50 cent army.

(aviation, military, historical, US) The original designation of the Curtiss P-60.

Of telephone numbers dialed in North America, widely used for fictional numbers in television shows, films, and other media.

(music) A chord progression, l–vi–IV–V, used in Western popular music, particularly common in the 1950s and early 1960s.

plural of 57-cell

plural of 5th grader