Q

130; In mathematics, quaternions are a non-commutative extension of complex numbers. They were first described by the Irish mathematician Sir William Rowan Hamilton in 1843 and applied to mechanics in three-dimensional space. At first, quaternions were regarded as pathological, because they disobeyed the commutative law ab = ba. Although they have been superseded in most applications by vectors, they still find uses in both theoretical and applied mathematics, in particular for calculations involving three-dimensional rotations; 131; 156; "Quaternion-ray weapons" 445; 511; 525; Wars, 526, 548; 533-34; 538-39; Quaternionic Weapon, 542; 557; Q-98 weapon, alive in Woevre's hands, 563; 564; 590; Wikipedia entry; Quaternions at MathWorld; Hamiltonian quaternions at PlanetMath; Finding the site of Hamilton's inspiration (by mathematical physicist John Baez); Conspiracy-theory takes on mathematical history [1] [2] (by Tom Bearden, promotor of a dubious free energy machine)

Queen Anne's Gate
490; an office block in Westminster, London, overlooking St. James's Park. The building was originally built as speculative office development but the Home Office moved for lack of space in its previous headquarters in Whitehall; 496; Wikipedia entry

Querkel
45; detective at White City Investigations