Ab 7sus2, 1st inversion (A# in the bass)
Also written as Ab7sus2/A#.
Notes, from the bass up
A# (bass)D#F#G#
The same notes as Ab 7sus2 (A#, D#, F# and G#), rearranged so A# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.