A polygon with one thousand sides or angles.
From Greek 'khiliás' (thousand) + 'gonia' (angle). The '-gon' suffix appears in polygon names like 'pentagon' (5 sides), 'hexagon' (6 sides), and 'decagon' (10 sides), all from Greek 'gonia' (angle).
The chiliagon is Immanuel Kant's famous philosophical example—he used it to show that we can understand the concept of a thousand-sided polygon mathematically even though we can't visualize it, becoming a key insight into how human reason grasps abstract quantities.
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