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In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon.. The heptagon is sometimes referred to as the septagon, using septa-(an elision of septua-), a Latin-derived numerical prefix, rather than hepta-, a Greek-derived numerical prefix (both are cognate), together with the suffix -gon for Greek: γωνἰα, romanized: gonía, meaning angle.