Voicing of B# Diminished 7

Drop 2 II

Back to B#dim7

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Left hand
B#2
Right hand
A3D#4F#4B#4
Family
Drop 2

The Drop 2 II voicing of B#dim7 stacks A, D#, F# and B# from the bottom up: the diminished 7th, minor 3rd, flat 5th and root 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 B#dim7 are Drop 2 I, Drop 2 III and Drop 2 IV.