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Description
That yesterday are following March 14. In this symbol of mathematical number named Pi, the first symbol in Switzerland named Leonhard Euler that created Pi to present to all countries in 1700s. But, the British mathematician named William Jones was devised to representation to Swiss mathematician, Leonhard. So, this symbol is once of the number in mathematics for the learning easy.

Description
That yesterday are following March 14. In this symbol of mathematical number named Pi, the first symbol in Switzerland named Leonhard Euler that created Pi to present to all countries in 1700s. But, the British mathematician named William Jones was devised to representation to Swiss mathematician, Leonhard. So, this symbol is once of the number in mathematics for the learning easy.