Voicing of Bb Dominant 7

Rooted I

Back to Bb7

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Left hand
Bb2D3F3Ab3
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4-Note Rooted

The Rooted I voicing of Bb7 stacks Bb, D, F and Ab from the bottom up: the root, major 3rd, 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 Bb7 is Rooted II.