B Major 7#11, 2nd inversion (F# in the bass)
Also written as Bmaj7#11/F#.
Notes, from the bass up
F# (bass)A#E#BD#
The same notes as B Major 7#11 (F#, A#, E#, B and D#), rearranged so F# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.