epigram (n.)

also epigramme, "short poem or verse which has only one subject and finishes by a witty or ingenious turn of thought," mid-15c., from Old French épigramme, from Latin epigramma "an inscription," from Greek epigramma "inscription (especially in verse) on a tomb, public monument, etc.; a written estimate," from epigraphein "to write on, inscribe" (see epigraph). "The term was afterward extended to any little piece of verse expressing with precision a delicate or ingenious thought" [Century Dictionary]. Related: Epigrammatist.