Voicing of D Diminished Triad

2nd Inversion

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Left hand
Ab2D3F3
Family
Triads

The 2nd Inversion voicing of Ddim stacks Ab, D and F from the bottom up: the flat 5th, root and minor 3rd of the chord.

It's one of the Triads voicings. The others for Ddim are Root Inversion, 1st Inversion and Doubled Root.