C dim7
The C dim7 chord consists of the C (Perfect unison), D# (Minor third), F# (Diminished fifth) and A (Major sixth) notes.

How to play the C dim7 chord
- Find C (Root) on the piano keyboard
- Add D# (Minor third) — 3 semitones above C
- Add F# (Diminished fifth) — 6 semitones above C
- Add A (Major sixth) — 9 semitones above C
- Press all 4 notes simultaneously to sound the C dim7 chord