G# Minor Major 9th, 1st inversion (B in the bass)
Also written as G#m(maj9)/B.
Notes, from the bass up
B (bass)D#GA#G#
The same notes as G# Minor Major 9th (B, D#, G, A# and G#), rearranged so B is the lowest note. Use it to move between chords with smaller jumps across the keyboard.