The G-flat power chord (abbreviated "Gb5 chord") is a two-note chord consisting of the notes G♭ and D♭. The chord is formed by removing the major third from a G-flat major chord.
G-flat power chord
G-flat fifth chord
G♭omit3 G♭(omit3) G♭no3 G♭(no3)
dyad (two-note chord)