limit point

A limit point of a set is a value that can be approached arbitrarily closely by elements of that set, even if the point itself is not necessarily part of the set. In other words, for a number to be a limit point, you can find elements of the set that get as close as you want to that number, from either side, without necessarily reaching it. This concept helps describe the behavior of sets and functions near certain points, indicating where values tend to cluster or accumulate.