quaternionyoudaoicibaDictYouDict[quaternion 词源字典]
"A complex number of the form w + xi + yj + zk, where w, x, y, z are real numbers and i, j, k are imaginary units that satisfy certain conditions", Mid 19th century: from late Latin quaternio(n-), from Latin quarterni (see quaternary).[quaternion etymology, quaternion origin, 英语词源]