Not CS but any study of limits in math, perhaps with differential equations. And it’s a useful term generally, much more likely to come up in conversation than “subtrahend” or “mantissa” but not nearly as much as “tangent.”

And that must be why I have yet to hear it, as I never took CS.

To save time in the future, bear in mind any time you think you are the only person that does or notices something: you aren't. This is due to the fact that people are all running on the same physical architecture, with very similar cultural and social ecosystems, plus the law of large numbers. Note that this does not apply to edge cases such as people engaged in activities or domains with a very small number of participants...