piano chord
Am7
A1C♭3E5G♭7
Minor triad with a minor seventh. The same four notes as a major sixth chord a third above.
What is true of it
Am7 is A, C, E and G — 1, b3, 5 and b7 counted from A.
These are also the notes of C6/A. 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.