B 13#11, 4th inversion (C# in the bass)
Also written as B13#11/C#.
Notes, from the bass up
C# (bass)E#G#BD#F#A
The same notes as B 13#11 (C#, E#, G#, B, D#, F# and A), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.