A Major 9#11, 5th inversion (D# in the bass)
Also written as Amaj9#11/D#.
Notes, from the bass up
D# (bass)AC#EG#B
The same notes as A Major 9#11 (D#, A, C#, E, G# and B), rearranged so D# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.