F# 7b13, 1st inversion (A# in the bass)
Also written as F#7b13/A#.
Notes, from the bass up
A# (bass)C#EDF#
The same notes as F# 7b13 (A#, C#, E, D and F#), rearranged so A# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.