The A flat dominant sharp ninth chord is a 5-note chord consisting of the notes Ab, C, Eb, Gb and B.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Ab7#9.
Interactive piano diagram for the A flat dominant sharp ninth chord
Chords that are a subset of Ab7#9. These contain less notes but all of them are included in Ab7#9.