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The Long Island Museum - Today is National Pi Day, so called because it's March 14 or 3/14 or 3.14. The number π (pi) is a mathematical constant. Originally defined as the
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![pi - "[not an acronym] name for Greek symbol representing the ratio of the circumference of a circle to its diameter; approximately 3.1416" by AcronymsAndSlang.com](http://acronymsandslang.com/acronym_image/2205/0370f0e7b7e27c583299c3d69b0a661d.jpg "pi - \"[not an acronym] name for Greek symbol representing the ratio of the circumference of a circle to its diameter; approximately 3.1416\" by AcronymsAndSlang.com")
pi - "[not an acronym] name for Greek symbol representing the ratio of the circumference of a circle to its diameter; approximately 3.1416" by AcronymsAndSlang.com
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