That's fascinating. We have gradated terms for probabilities. Like dice roll percentages, except in more useful ranges for common occurrences. I feel like the sigma of some understanding one of my proofs now is one.
The term "sigma" is used in statistical sciences; 1-sigma refers to 68% certainty, 2-sigma refers to 95% certainty, and 3-sigma refers to 99.7% certainty
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