outlier

noun

1. A person or thing situated away from the main body or outside its proper place.

   “Observing as an outlier from Scotland, Hynes sums up the industry problem: "The conversation we've had for this article is really about creating an environment in which better decisions can be taken, isn't it?”

2. (figuratively)An exception.

   “And in a world where police officers are mostly paired by species (zebras with zebras, hippos with hippos, etc.), Judy and Nick’s rare bunny/fox combo marks them as outliers.”

3. A part of a formation separated from the rest of the formation by erosion.
4. A value in a statistical sample which does not fit a pattern that describes most other data points; specifically, a value that lies 1.5 IQR beyond the upper or lower quartile.