Root on A string
x45x56
C♯dim7 is the C♯ diminished 7 chord. Its notes are C♯, E, G and B♭. It is the same chord as D♭dim7. Stacked minor thirds. Its symmetrical sound makes it useful as a passing chord.
x45x56
Numbers show frets from the low E string to the high e string; x means don't play that string.
Every C♯, E, G and B♭ on the first 12 frets. The filled dots are the root, C♯. Build your own shape from any nearby group.
Other C♯ chords
Other diminished 7 chords