Dictionary: Cbb5 Power Chord

Two notes:  Root (C double-flat) and fifth (G double-flat).

Dictionary: Cx5 Power Chord

Two notes:  Root (C double-sharp) and fifth (G double-sharp).

Dictionary: Gbb5 Power Chord

Two notes:  Root (G double-flat) and fifth (D double-flat).

Dictionary: Fx5 Power Chord

Two notes:  Root (F double-sharp) and fifth (C double-sharp).

Dictionary: Dbb5 Power Chord

Two notes:  Root (D double-flat) and fifth (A double-flat).

Dictionary: B#5 Power Chord

Two notes:  Root (B-sharp) and fifth (F double-sharp).

Dictionary: Abb5 Power Chord

Two notes:  Root (A double-flat) and fifth (E double-flat).

Dictionary: E#5 Power Chord

Two notes:  Root (E-sharp) and fifth (B-sharp).

Dictionary: Ebb5 Power Chord

Two notes:  Root (E double-flat) and fifth (B double-flat).

Dictionary: A#5 Power Chord

Two notes:  Root (A-sharp) and fifth (E-sharp).

Dictionary: Bbb5 Power Chord

Two notes:  Root (B double-flat) and fifth (F-flat).

Dictionary: D#5 Power Chord

Two notes:  Root (D-sharp) and fifth (A-sharp).

Dictionary: Fb5 Power Chord

Two notes:  Root (F-flat) and fifth (C-flat).  See also:  E5 chord.

Dictionary: G#5 Power Chord

Two notes:  Root (G-sharp) and fifth (D-sharp).

Dictionary: Cb5 Power Chord

Two notes:  Root (C-flat) and fifth (G-flat).  See also:  B5 chord.

Dictionary: C#5 Power Chord

Two notes:  Root (C-sharp) and fifth (G-sharp).

Dictionary: Gb5 Power Chord

Two notes:  Root (G-flat) and fifth (D-flat).

Dictionary: F#5 Power Chord

Two notes:  Root (F-sharp) and fifth (C-sharp).

Dictionary: Db5 Power Chord

Two notes:  Root (D-flat) and fifth (A-flat).

Dictionary: B5 Power Chord

Two notes:  Root (B) and fifth (F-sharp).