The terms “atypical” and “edge case” are not meaningful with a single sample size that is also the only known observation. There is only the one sample and that

The terms “atypical” and “edge case” are not meaningful with a single sample size that is also the only known observation. There is only the one sample and that’s all you can observe. There’s nothing to compare it against to give “atypical” and “edge case” meaning. Individual samples can be meaningful in a larger distribution, but you still need multiple samples to establish any distribution at all. I think you are referring to outliers within the distribution.