A geometric shape with seven straight sides and seven angles, often used in mathematics, design, and architecture.
From Greek 'hepta' (seven) + 'gonia' (angle). The term emerged in ancient Greek mathematics and geometry to classify polygons by their angle count.
Heptagons appear in nature less often than hexagons, but they're incredibly important in architecture—the British £1 coin is actually a heptagon because its curved sides and unique angle pattern make it instantly recognizable by blind people using touch alone!
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