A 13#11, 4th inversion (B in the bass)
Also written as A13#11/B.
Notes, from the bass up
B (bass)D#F#AC#EG
The same notes as A 13#11 (B, D#, F#, A, C#, E and G), rearranged so B is the lowest note. Use it to move between chords with smaller jumps across the keyboard.