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