Quadrangle (geography), a 7.5-minute topographic map produced by the United States Geological Survey, covering in greater detail one quarter of the area of a 15-minute map
Quadtree, a tree data structure typically used to partition a 2-dimensional space
Quad precision, a number stored using 16 eight-bit bytes, which is four times the size of 4-byte single precision
Quad Flat Package, a type of package for surface mounted integrated circuit
Quad Electroacoustics, a British manufacturer of electronic amplifiers, tuners and loudspeakers mainly for the high-end domestic market
Quad, an abbreviation for a type of videotape recorder, especially 2" Quadruplex videotape, where there are four record heads on a spinning drum which move perpendicular to the direction of tape travel
Quad, telecommunication term referring to four conductors formation used to form two balanced pairs
Star quad, four conductors in square formation, in which opposite conductors are connected in parallel at both ends to form a single, magnetically-concentric balanced pair, in order to minimise magnetic induction
other term for a speeder, a motorized vehicle used for maintenance of ways on railroads
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