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The number system used by the Greeks in the first millennium was called Aegan System. Attic Numerals was later formed on which the Roman System was built. The Attic Numerals used the first letter the name of the number the represented.
Greek numerals are a system of representing numbers using the letters of the Greek alphabet. They are also known as Milesian numerals, Alexandrian numerals, or alphabetic numerals. In modern Greece, they are still in use for ordinal numbers.
The Greek letter π was adopted for the number from the Greek word for perimeter "περίμετρος", first by William Jones in 1707, and popularized by Leonhard Euler in 1737.
A 14-gon has fourteen sides. Any number suffixed by -gon is a polygon with that number of sides. A 14-gon is also called a tetradecagon, tetra being Greek for four, deka being Greek for ten, and gon deriving from gonus, meaning "angle" or "knee".
Pi isn't an invention, it's a definition. It is defined as the ratio of any circle's circumference to it's diameter. If anything, it's a discovery. Euclidean geometry, attributed by Greek mathematician Euclid was the first recorded system used to show Pi as a mathematical constant. Archimedes was a famous ancient Greek mathematician and inventor. He accomplished the computation of pi.