Bb 7sus2, 3rd inversion (G# in the bass)
Also written as Bb7sus2/G#.
Notes, from the bass up
G# (bass)A#B#E#
The same notes as Bb 7sus2 (G#, A#, B# and E#), rearranged so G# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.