Heptagon
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September. it uses the prefix 'Sept,' Latin for seven, as it was at one point the seventh month in the year. And Septagon is not a word in the English language. The correct name for a 7-sided polygon is "heptagon." It is derived from "hepta," the Greek word for "seven."
7 (from the greek "epta", meaning, you guessed it, seven)
Ancient Greek "hepta" = seven, "gonia" = angle. It is a polygon with seven angles (vertices).
6 sides, 6 angles tri-3 tetra/quadrilateral-4 penta-5 hexa-6 hepta-7
Nine, if the prism has both a base and a top (plus the seven sides). Nine faces is customary for a heptagonal prism (but there are variants ... see below). If the prism is shaped in the form of a pyramid, then eight. There are seven faces, above the plane, plus its base, making eight total faces. (Hepta- is the Greek root word for the number seven.)