Voicing of Ab Half Diminished

Rooted I

Back to Abm7b5

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Left hand
Ab2Cb3Ebb3Gb3
Family
4-Note Rooted

The Rooted I voicing of Abm7b5 stacks Ab, Cb, Ebb and Gb from the bottom up: the root, minor 3rd, flat 5th and minor 7th of the chord.

It's one of the 4-Note Rooted voicings: four-note voicings with the root on the bottom or inside, in the left hand. The other for Abm7b5 is Rooted II.