The A sharp minor chord is a 3-note chord consisting of the notes A#, C# and E#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as A#m.
Chords that are a superset of A#m. The chords include more notes but always A#, C# and E#.
Chords that are a subset of A#m. These contain less notes but all of them are included in A#m.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the A#m chord. Feel free to save or share the image as needed.