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English is 'around' and in Greek it is peri, as in the word 'perimeter'.
It is pi.
it is a number like 9958
That's pi, the sixteenth letter of the Greek alphabet. In mathematics, it is defined as the numerical value of the ratio of the circumference of a circle to its diameter.
There are three famous Greek problems of antiquity. They are the trisection of the general angle, the doubling of a cube and the squaring of a circle.