B 13sus4, 4th inversion (C# in the bass)
Also written as B13sus4/C#.
Notes, from the bass up
C# (bass)G#BEF#A
The same notes as B 13sus4 (C#, G#, B, E, F# and A), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.