The D double harmonic (Bhairav) scale has 7 notes: D – E♭ – F♯ – G – A – B♭ – C♯. The double harmonic major has a ♭2 and a ♭6 around a major 3rd and major 7th: two gaps of three frets. In India it is Bhairav thaat, the morning raga scale; elsewhere it is called the Arabic or Byzantine scale.
Compared with the D major scale it has ♭2 (E♭ instead of E), ♭6 (B♭ instead of B).
The explorer above is set to D double harmonic (Bhairav): 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.