F# Dominant 13th, 2nd inversion (C# in the bass)
Notes, from the bass up
C# (bass)EG#BD#F#A#
The same notes as F# Dominant 13th (C#, E, G#, B, D#, F# and A#), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.