B 13b9, 2nd inversion (F# in the bass)
Also written as B13b9/F#.
Notes, from the bass up
F# (bass)ACG#BD#
The same notes as B 13b9 (F#, A, C, G#, B and D#), rearranged so F# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.