Biqraqa (Arabic: بقراقة) is a Syrian village located in the Masyaf Subdistrict in Masyaf District, located west of Hama.

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.

Biquz (Persian: بي قوز, also Romanized as Bīqūz) is a village in Targavar Rural District, Silvaneh District, Urmia County, West Azerbaijan Province, Iran.

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

Quartic or biquadratic reciprocity is a collection of theorems in elementary and algebraic number theory that state conditions under which the congruence x4 ≡ p (mod q) is solvable; the word "reciprocity" comes from the form of some of these theorems, in that they relate the solvability of the congruence x4 ≡ p (mod q) to that of x4 ≡ q (mod p).

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.