Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
B♭WCHD♭WE♭WFWGHA♭WB♭
What is true of it
B♭ Dorian is B♭, C, D♭, E♭, F, G and A♭, and back to B♭.
Its steps are W – H – W – W – W – H – W, where W is a whole step and H a half.
On the same tonic, B♭ 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.
Chords made only of these notes
Found by testing every chord in the catalogue against these 7 sounds, not chosen.