Voicing of Bb Dominant 7

Rooted Guide Tones II

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Left hand
Bb2Ab3D4
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Rooted Guide Tones

The Rooted Guide Tones II voicing of Bb7 stacks Bb, Ab and D from the bottom up: the root, minor 7th and major 3rd of the chord.

It's one of the Rooted Guide Tones voicings: the root, 3rd and 7th in the left hand, as bebop pianists comped. The other for Bb7 is Rooted Guide Tones I.