Voicing of F# Diminished 7

Rooted III

Back to F#dim7

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Left hand
C3Eb3F#3A3
Family
4-Note Rooted

The Rooted III voicing of F#dim7 stacks C, Eb, F# and A from the bottom up: the flat 5th, diminished 7th, root and minor 3rd of the chord.

It's one of the 4-Note Rooted voicings: four-note voicings with the root on the bottom or inside, in the left hand. The others for F#dim7 are Rooted I, Rooted II and Rooted IV.