D#dim (D# diminished): D# F# A. Formula 1 ♭3 ♭5. Two minor 3rds stacked: tense and unstable, it is the vii° of a major key and wants to resolve.
Made of3
Contains & part of32
Inversions3
- D#dim5/3
Root position · D# F# A
- D#dim/F#6
1st inversion · F# A D#
- D#dim/A6/4
2nd inversion · A D# F#