In music, sharp, dièse (from French), or diesis (from Greek) means higher in pitch. More specifically, in musical notation, sharp means "higher in pitch by a semitone (half step)," and has an associated sharp symbol, , which may be found in key signatures or as an accidental. Sharp is contrasted with flat, which refers to a lowering of pitch. Intonation may be flat, sharp, or both, successively or simultaneously.