Voicing of B Diminished 7

Drop 2 IV

Back to Bdim7

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Left hand
B2
Right hand
D4Ab4B4F5
Family
Drop 2

The Drop 2 IV voicing of Bdim7 stacks D, Ab, B and F from the bottom up: the minor 3rd, diminished 7th, root and flat 5th of the chord.

It's one of the Drop 2 voicings: four-note chords in close position with the second note from the top dropped an octave, played over the root. The others for Bdim7 are Drop 2 I, Drop 2 II and Drop 2 III.