B 13sus4, 3rd inversion (A in the bass)
Also written as B13sus4/A.
Notes, from the bass up
A (bass)C#G#BEF#
The same notes as B 13sus4 (A, C#, G#, B, E and F#), rearranged so A is the lowest note. Use it to move between chords with smaller jumps across the keyboard.