Bb Quartal (So What), 2nd inversion (G# in the bass)
Also written as Bb quartal/G#.
Notes, from the bass up
G# (bass)B#E#A#D#
The same notes as Bb Quartal (So What) (G#, B#, E#, A# and D#), rearranged so G# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.