D# Minor Major 9th, 2nd inversion (A# in the bass)
Also written as D#m(maj9)/A#.
Notes, from the bass up
A# (bass)DE#D#F#
The same notes as D# Minor Major 9th (A#, D, E#, D# and F#), rearranged so A# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.