The D Locrian scale has 7 notes: D – E♭ – F – G – A♭ – B♭ – C. Locrian is the darkest mode: a minor scale with a ♭2 and a ♭5, built on the 7th note of the major scale. Its root chord is diminished, so it is used for tension rather than as a home key.
Compared with the D major scale it has ♭2 (E♭ instead of E), ♭3 (F instead of F♯), ♭5 (A♭ instead of A), ♭6 (B♭ instead of B), ♭7 (C instead of C♯).
The explorer above is set to D Locrian: 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.