The B♭ melodic minor scale has 7 notes: B♭ – C – D♭ – E♭ – F – G – A. The melodic minor (jazz minor) is a minor scale with a major 6th and 7th: a minor 3rd with the top of a major scale. Jazz players use it and its modes to colour minor chords and altered dominant chords.
B♭ and A♯ are the same pitch, so this page covers both names; the notes are spelled from B♭, the way the key is usually written. Compared with the B♭ major scale it has ♭3 (D♭ instead of D).
The explorer above is set to B♭ melodic minor: the whole neck is mapped, and you can zoom into any of its 7 positions, change the labels to degrees or fingers, and hear it up, down and in patterns.