The C diminished chord (abbreviated "Cdim chord") is a triad consisting of the notes C, E, and G. The chord is formed by lowering the fifth of a C minor chord a half step.

Name
C diminished chord
Synonym
C diminished triad
Notes
C E G
Intervals
1 3 5
Chord symbol
Co
Alternative symbols
Cdim Cm(b5) Cmb5
Type
triad (three-note chord)

Cdim chord on piano

Cdim chord on guitar

Cdim chord on ukulele

Cdim chord on the staff