B♭dim7
B♭ Diminished 7th · 4 fingerings
The fully diminished seventh stacks three minor thirds, so B♭dim7 is perfectly symmetrical: invert it and you get another diminished seventh chord. That symmetry means one shape covers four different roots and can slide anywhere on the neck, which is why jazz and classical players use it as a pivot to modulate between distant keys. Tense, dramatic, and never a place to stop.
B♭dim7 · position 1
B♭dim7 · position 2
B♭dim7 · position 3 · fret 6
B♭dim7 · position 4 · fret 8
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