piano chord
A♯m(maj7)
A♯1C♯♭3E♯5G𝄪7
Minor triad, major seventh — the tonic chord of harmonic minor.
Written the other way round it is B♭m(maj7) — the same twelve keys on a piano, a different piece of notation.
What is true of it
A♯m(maj7) is A♯, C♯, E♯ and G𝄪 — 1, b3, 5 and 7 counted from A♯.
G𝄪 is a double sharp, and it has to be: every letter from A♯ upwards is used once, so the 7 cannot be written any other way.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
A♯ in other shapes
Cm(maj7)C♯m(maj7)D♭m(maj7)Dm(maj7)D♯m(maj7)E♭m(maj7)Em(maj7)Fm(maj7)all 374