guitar chord
Adim
A1C♭3E♭♭5
Two minor thirds stacked. The fifth is diminished, so it cannot be dropped without losing the chord.
Every fingering that fits a hand
x0121x
open
x07545
hard
50754x
hard
x0754x
easy
xx7545
hard
What is true of it
Adim is A, C and E♭ — 1, b3 and b5 counted from A.
The easiest of the 5 fingerings below is x0121x: 3 fingers, held at the 1st fret.
1 of them use open strings, which is what makes a shape quiet to change to.
2 strings stay silent.
Where its notes are on the neck
The brass dots are A, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
Adim/C
x3121x
Adim/E♭
x6754x
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.