The term "quad" can refer to different things, depending on the context. Here are some possible meanings:
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Quadrilateral Security Dialogue: This is an informal strategic forum comprising four nations: the United States, Australia, India, and Japan. It was initiated in 2007 by Japanese Prime Minister Shinzo Abe, with the support of Australian Prime Minister John Howard, Indian Prime Minister Manmohan Singh, and U.S. Vice President Dick Cheney. The Quad aims to tackle security, economic, and health issues in the Indo-Pacific region, and its diplomacy has waxed and waned over the years. The Quad is not a formal alliance, but a loose grouping of democracies and vibrant economies that share concerns about Chinas increasingly assertive behavior in the region.
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Quadrilateral: This term can also refer to a four-sided polygon, also known as a quadrangle or quadrilateral. Examples of quadrilaterals include squares, rectangles, parallelograms, trapezoids, and kites.
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Quadriceps: This is a group of four muscles located in the front of the thigh that work together to extend the knee and flex the hip.
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Quadraphonic: This is a type of sound recording and reproduction that uses four channels instead of the two channels used in stereo.
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Quadcopter: This is a type of drone that has four rotors and can hover and maneuver in different directions.
In the context of the search results, the most relevant meaning of "quad" is the Quadrilateral Security Dialogue.
