D Augmented Major 7th, 2nd inversion (A# in the bass)
Also written as Daug(maj7)/A#.
Notes, from the bass up
A# (bass)C#DF#
The same notes as D Augmented Major 7th (A#, C#, D and F#), rearranged so A# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.