The digit used in the modern Western world to represent the number 2 traces its roots back to the Indic Brahmic script, where "2" was written as two horizontal lines.

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The superscript two, ², is used in mathematics to denote the square of a number or variable. It also represents the second derivative in calculus when used as a notation for differentiation.

The number two (2) is the second positive integer and the first prime number. It is even, and is the only even prime (the primes other than 2 are called the odd primes).

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