3.1
3.1 may refer to:
- An approximation of the mathematical constant π
- A shorthand reference to release 3.1 of some piece of software, such as Windows 3.1
- The estimated percentage of 2024 YR₄ hitting Earth on December 22, 2032 since the date of February 18, 2025
This disambiguation page lists articles associated with the same number.
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