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The number 80 has several notable properties and cultural associations. Mathematically, it is an even composite number and can be expressed as the product of the primes 2 and 5 (2⁴ × 5). It is also a tetrahedral number, which means it represents a pyramid with a triangular base and three sides (the sum of the first four triangular numbers). In Roman numerals, 80 is written as LXXX. In the periodic table, 80 is the atomic number of mercury, a unique metal that is liquid at room temperature and used in thermometers, barometers, and various scientific instruments. Culturally, reaching the age of 80 is considered a significant milestone, often celebrated as an octogenarian birthday. Historically, 80 AD was marked by the completion of the Colosseum in Rome, an iconic symbol of ancient Roman engineering and culture.