F# Major 13th, 5th inversion (B in the bass)
Notes, from the bass up
B (bass)D#F#A#C#E#G#
The same notes as F# Major 13th (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.