[algebra] In algebra, the terms left and right denote the order of a binary operation (usually, but not always called `multiplication`) in non-commutative algebraic structures. A binary operation ∗ is usually written in the infix form: A two-sided property is fulfilled on both sides. An one-sided property is related to one (unspecified) o...
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http://en.wikipedia.org/wiki/Left_and_right_(algebra)

Left and right is London Cockney rhyming slang for fight.
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http://www.probertencyclopaedia.com/browse/ZL.HTM
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