Reproductive Isolation

https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_General_Biology_(Boundless)/18%3A_Evolution_and_the_Origin_of_Species/18.02%3A_Formation_of_New_Species/18.2B%3A_Reproductive_Isolation

Reproductive isolation is a collection of mechanisms, behaviors, and physiological processes that prevent the members of two different species that cross or mate from producing offspring, or which ensure that any offspring that may be produced is not fertile.

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https://sciencing.com/five-types-isolation-biology-8501726.html

The field of biology describes "isolation" as a process by which two species that could otherwise produce hybrid offspring are prevented from doing so.