B 13b9, 3rd inversion (A in the bass)
Also written as B13b9/A.
Notes, from the bass up
A (bass)CG#BD#F#
The same notes as B 13b9 (A, C, G#, B, D# and F#), rearranged so A is the lowest note. Use it to move between chords with smaller jumps across the keyboard.