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English is 'around' and in Greek it is peri, as in the word 'perimeter'.
it is a number like 9958
It is pi.
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.