G#dim (G# diminished): G# B D. 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
- G#dim5/3
Root position · G# B D
- G#dim/B6
1st inversion · B D G#
- G#dim/D6/4
2nd inversion · D G# B