Quartal - AbsoluteAstronomy.com

Quartal may refer to:

Quartal harmony
Quartal and quintal harmony
In music, quartal harmony is the building of harmonic structures with a distinct preference for the intervals of the perfect fourth, the augmented fourth and the diminished fourth. Quintal harmony is harmonic structure preferring the perfect fifth, the augmented fifth and the diminished fifth...

, music featuring chords built from fourths
Quaternary numeral system
Quaternary numeral system
Quaternary is the base- numeral system. It uses the digits 0, 1, 2 and 3 to represent any real number.It shares with all fixed-radix numeral systems many properties, such as the ability to represent any real number with a canonical representation and the characteristics of the representations of...

, a system for representing numbers based on powers of four

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