What are the slashes in music called?

The slashes in music notation are often referred to as "slash notation" or "slash chords." They indicate specific chords to be played, with the note before the slash representing the chord and the note after indicating the bass note to be played. For example, in a chord written as "C/G," it means to play a C major chord with G as the bass note. This notation is useful for providing harmonic guidance while allowing for flexibility in arrangement.