Abdim chord
Ab diminished
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>G
Gb
G
Ab1
A
Bb
B
C
Db
D
Eb
E
F
Gb
G
Ab
C
C
Db
Db5
Eb
E
F
Gb
G
Ab
A
Bb
B
C
D
E
Eb
E
F
Gb
G
Ab1
A
Bb
B
C
Db
D
Eb
E
Ab
A
Ab
A
Bb
Bb3
C
Db
D
Eb
E
F
Gb
G
Ab
A
B
3
5
7
10
The Abdim chord has the formula 1, b3, b5 with notes Ab, B, D
The diminished chord is a variation of the minor chord with a flat 5th note. It is less common in popular music due to its high tension, but can sometimes be used as a bridge between two chords to emphasize the release of tension.