C Phrygian

C1D♭♭2E♭♭3F4G5A♭♭6B♭♭7

Minor with a flattened second — the half step right above the tonic is the whole character.

Written out

Fig. 2 · C Phrygian, ascending

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

CHD♭WE♭WFWGHA♭WB♭WC

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

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

On the same tonic, C natural minor differs from it by exactly one note.

Across the first twelve frets of the ukulele its notes fall in 30 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.