A minor 9th chord
Am9 chord for piano with keyboard diagram.
Explanation: The A minor ninth is a five-note chord. For practical reasons the chord is normally played with omitted notes and/or inverted. The chord is often abbreviated as Am9.
Theory: The Am9 chord is constructed with a root, a minor third, a perfect fifth, a minor seventh and a major ninth.
Notes: A - C - E - G - B