Db 7b13, 4th inversion (A in the bass)
Also written as Db7b13/A.
Notes, from the bass up
A (bass)C#E#G#B
The same notes as Db 7b13 (A, C#, E#, G# and B), rearranged so A is the lowest note. Use it to move between chords with smaller jumps across the keyboard.