quaternion

If you derive a quaternion multiplication table from the fundamental formula Hamilton carved into Broome Bridge, you’ll find that ij = k, but ji = -k.

From Slate ● Oct. 14, 2016

Indeed, mere months after Hamilton’s quaternion brain wave, his friend John T. Graves debuted “octaves,” a kind of double quaternion now called octonions.

From Slate ● Oct. 14, 2016

Every pulse pushes nature's quaternion along life's currents recreating us afresh; the morn feeding the morn, Memnon's music issuing from every stop, as if the Orient itself had sung.

From Tablets by Amos Bronson Alcott

Air, and ye Elements, the eldest birth Of Nature's womb, that in quaternion run Perpetual circle, multiform; and mix And nourish all things; let your ceaseless change Vary to our great Maker still new praise.

From Paradise Lost by John Milton

The customary quire is a gathering of eight leaves, forming a quaternion proper.

From A Sixth-Century Fragment of the Letters of Pliny the Younger A Study of Six Leaves of an Uncial Manuscript Preserved in the Pierpont Morgan Library New York by E. A. (Elias Avery) Lowe