In abstract algebra, the biquaternions are the numbers w + x i + y j + z k, where w, x, y, and z are complex numbers and the elements of {1, i, j, k} multiply as in the quaternion group.

In mathematics, a biquaternion algebra is a compound of quaternion algebras over a field.

Biquinhas is a municipality in the north of the Brazilian state of Minas Gerais. As of 2007 the population was 2,592 in a total area of 457 km².

In mathematics, biquandles and biracks are generalizations of quandles and racks. Whereas the hinterland of quandles and racks is the theory of classical knots, that of the bi-versions, is the theory of virtual knots.

Biquini Cavadão is a Brazilian rock band formed in Rio de Janeiro in 1985. They are an influential 1980s band that still continues successful to this day.

In algebra, a quartic function is a function of the form

Quinidine is a pharmaceutical agent that acts as a class I antiarrhythmic agent (Ia) in the heart. It is a stereoisomer of quinine, originally derived from the bark of the cinchona tree.

The Chinese water chestnut or water chestnut (Eleocharis dulcis) is a grass-like sedge native to Asia (China, Japan, India, Philippines, etc.), Australia, tropical Africa, and various islands of the Pacific and Indian Oceans.

Biquefarre is a 1983 French docufiction film, written and directed by Georges Rouquier, about the uncertain future facing a small farm in Aveyron.

In astrology, an aspect is an angle the planets make to each other in the horoscope, also to the ascendant, midheaven, descendant, lower midheaven, and other points of astrological interest.