Double Harmonic
LookNoHands has the Double Harmonic scale as being ;
G Ab B C Db E F G
and the Hungarian Gypsy as being
G Ab B C D Eb F# G
The Falcon on Guitar tricks has the double Harmonic as:
G Ab B C D Eb F# G
I'm not sure which one is right, I always considered G Ab B C D Eb F# G as being double harmonic.