If you have ever taken math then you must know what this symbol represents.  Pi or ? is a mathematical constant whose value is the ratio of any circle’s circumference to its diameter in Euclidean space; this is the same value as the ratio of a circle’s area to the square of its radius. It is approximately equal to 3.14159 in the usual decimal notation (see the table for its representation in some other bases). ? is one of the most important mathematical and physical constants: many formulae from mathematics, science, and engineering involve ?.   This individual must be a math teacher or an engineer.  I wonder what inspire him to get this tattoo?

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