F 7alt, 5th inversion (Db in the bass)
Also written as F7alt/Db.
Notes, from the bass up
Db (bass)FAEbGbG#
The same notes as F 7alt (Db, F, A, Eb, Gb and G#), rearranged so Db is the lowest note. Use it to move between chords with smaller jumps across the keyboard.