This Mode / Scale is mode seven of the mode series. It’s used over a G minor Seventh Flat Five Chord in the key of A flat, (G-7b5, Gm7b5 and also called a half diminished scale). In truth it’s just an A Flat sclae starting on the G note. By learning it you’ll be able to solo over those G minor flat 5 chords and know to use the D flat instead of the D natural.
To download the free printable pdf version click locrian_mode_g