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The word quad can mean a number of things:

• A prefix meaning "four"
• A quad bike - see All-terrain vehicle
• In architecture, the abbreviation for a quadrangle
• A play by Samuel Beckett; see Quad (play)
• A telecommunication term
• The Quadrangle Club, one of the eleven eating clubs at Princeton University
• In Plane Geometry, a Quadrilateral is a four sided figure
• In studies of animal locomotion and walking machines, a quadrupedA quadruped is an animal having exactly four legs. While the argument may be made that "every limb, including an arm or wing, is just a modified leg", such a sense of "quadruped" is better described as a tetrapod, evoking the taxonomic unit tetrapoda the is a four-legged creature or mechanism
• The name of a well reputed British manufacturer of electronic amplifierAn electronic amplifier is a device for increasing the power of a signal. It does this by taking power from a power supply and shaping the output to match the input signal. This process invariably introduces some noise and distortion into the signal, ands, tunerA tuner is a device to adjust the resonant frequency of an antenna or transmission line to work most efficiently at one frequency or band of frequencies. A tuner is a radio receiver without an amplifier or loudspeaker, which is often constructed for supers and loudspeakerA loudspeaker is a device which converts an electrical signal into sound. Dynamic loudspeakers A Dynamic Cone Loudspeaker The traditional design is in two parts, a fibrous semi-rigid cone and attached to the apex of the cone is a coil of fine wire (usualls mainly for the high-end domestic market
• The short form of a muscle's name: the quadricepsThe quadriceps femoris commonly the 'quadriceps', is a large muscle in the thigh, composed of the sections rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis. External link .
• An unit of energyThis article is about the scientific concept. Energy use by humans is discussed in other articles''. Energy generally and qualitatively speaking, is the property (or the quantity of the property) of doing things or supplying power. The expressions energy (short for quadrillion) defined as 10¹⁵ BTUs (about 1.055 × 10¹⁸ JThe joule (symbol J also called newton metre or coulomb volt is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honour of the physicist James Prescott Joule (1818-1889). 1 joule 1 N · 1 m 1 newton · 1 metre 1 k)
• In computer science, a seldom-used unit of information defined as four eight- bit bytes: quad precision.
• One 1000th part of the fictional ( Star Trek) unit of a kiloquad

In the language used by trade negotiators, the 'quad' are the countries of the United States, Japan and Canada, plus the European Union. These four economies are responsible for around 61% of world imports by value, and 71% of world exports, and so they have considerable clout within the World Trade Organisation.