Bb Minor 9b5, 2nd inversion (E in the bass)
Also written as Bbm9b5/E.
Notes, from the bass up
E (bass)G#B#A#C#
The same notes as Bb Minor 9b5 (E, G#, B#, A# and C#), rearranged so E is the lowest note. Use it to move between chords with smaller jumps across the keyboard.