mathematical constant
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A mathematical constant is a special number that stays the same and appears again and again in mathematics because it's interesting or important in some way. These constants help mathematicians describe patterns and solve problems across different areas of math and science.
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The circumference of a circle with diameter 1 is π.
A mathematical constant is a number whose value is fixed by an unambiguous definition, often referred to by a special symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. Constants arise in many areas of mathematics, with constants such as e and π occurring in such diverse contexts as geometry, number theory, statistics, and calculus.