piano chord
Am7♭5
A1C♭3E♭♭5G♭7
A diminished triad with a minor seventh rather than a diminished one — half diminished, and not the same chord as dim7.
What is true of it
Am7♭5 is A, C, E♭ and G — 1, b3, b5 and b7 counted from A.
These are also the notes of Cm6/A. Which name is right depends on what is underneath and what came before — the notes alone do not decide.