Fdim chord
F diminished
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G
F#
G
G#b3
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
C
C
C#
D
D#
E
F1
F#
G
G#
A
A#
B
C
F
E
D#
E
F1
F#
G
G#
A
A#
B
C
C#
D
D#
E
F
A
G#
A
A#
Bb5
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The Fdim chord has the formula 1, b3, b5 with notes F, G#, B
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.