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• I definition |Dictionary.com

  noun, plural I's or Is, i's or is. 1. the ninth letter of the English alphabet, a vowel. 2. any spoken sound represented by the letter I or i, as in big, nice, or ski.

• Pi - Wikipedia, the free encyclopedia

  Pi or π is a mathematical constant which represents the ratio of any circle 's circumference to its diameter in Euclidean geometry, which is the same as the ratio of a circle's ...

• I - Wikipedia, the free encyclopedia

  I is the ninth letter of the Latin alphabet. Its English name is i (pronounced /aɪ/).