B Minor 9b5, 4th inversion (C# in the bass)
Also written as Bm9b5/C#.
Notes, from the bass up
C# (bass)BDFA
The same notes as B Minor 9b5 (C#, B, D, F and A), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.