notation - two or three dots

I have a more general question to ask:
about using the $\cdots$ symbol.

As far as I have heard three dots will represent that it continues up to infinity.

And I have found (mostly in computer programming) that two dots will be used in a case to indicate the terms between two specific points.

So my question is what is suitable to write in a case where finite number of terms are used.

For example Consider the set with $n$ number of elements. Let them be
$$x_1,x_2, \cdot \cdot x_n \;\text{ two dots. }$$ Or is it $$x_1,x_2, \cdots x_n\;\;?$$