B Phrygian dominant

B1C♭2D♯3E4F♯5G♭6A♭7

The fifth mode of harmonic minor: a flat second over a major third, so the step from the second to the third is a step and a half.

Written out

Fig. 2 · B Phrygian dominant, ascending

Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.

BHCW+HD♯HEWF♯HGWAWB

B Phrygian dominant is B, C, D♯, E, F♯, G and A, and back to B.

Its steps are H – W+H – H – W – H – W – W, where W is a whole step and H a half.

On the same tonic, B Phrygian differs from it by exactly one note.

Across the first twelve frets of the ukulele its notes fall in 32 places, which is what makes a scale a shape rather than a list.

Found by testing every chord in the catalogue against these 7 sounds, not chosen.