piano chord
Fm7
F1A♭♭3C5E♭♭7
Minor triad with a minor seventh. The same four notes as a major sixth chord a third above.
What is true of it
Fm7 is F, A♭, C and E♭ — 1, b3, 5 and b7 counted from F.
These are also the notes of A♭6/F and G♯6/F. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
On an instrument that cannot reach all 4, the 5 goes first, in that order.