A power chord is a colloquial name for a chord in guitar music, especially electric guitar, that consists of the root note and the fifth, as well as possibly octaves of those notes. Power chords are commonly played on amplified guitars, especially on electric guitar with intentionally added distortion or overdrive effects. Power chords are a key element of many styles of rock, especially heavy metal and punk rock.

double-reed wind-cap instrument with tuning and fingering equivalent to that of an actual bagpipe chanter (although sounding an octave lower), which is also used by pipers as a practice instrument (CT)

in feathered beaming, the principal horizontal beam towards which other sloping beams converge (CT)