More specifically, these are "notable programming languages".

There are any number of specialty programming languages which aren't on the list.

For example, the language "Seq" was recently posted here, at https://news.ycombinator.com/item?id=22107510 , and is not on the list.

For more examples, the esoteric languages at https://en.wikipedia.org/wiki/Esoteric_programming_language are not included.

That said, it's pretty complete.