F 6/9 chord
F6/9 chord for piano with keyboard diagram.
Explanation: The F sixth/ninth is a five-note chord. Due to practical circumstances, however, the fifth (C) is often omitted and/or the chord is played inverted. The chord is abbreviated F6/9. It can also be written F6add9 or Fmaj6add9.
Theory: The F6/9 chord is constructed with a root, a major third, a perfect fifth, a major sixth and a major ninth. That gives the chord formula 1 - 3 - 5 - 6 - 9.
Notes: F - A - C - D - G