C♯5 (also written D♭5) is a power chord chord made of 2 notes: C♯, G♯. It sounds strong and neutral, with no third to make it major or minor, and you hear it in rock, punk and metal, especially with distortion. It is the I chord of D♭ major and turns up in 5 other keys.
The library above opens on C♯5 with 12 shapes up and down the neck, starting with hand-checked ones. Tap a shape to hear it, or play it one string at a time.