What are 4 periods at the end of a sentence called?

Four periods at the end of a sentence are called quadruple points or quadruple dots. This is a punctuation mark used in specific situations, such as:

* Ellipsis: When indicating omitted text or a pause in speech, it's commonly three periods, but sometimes four are used for extra emphasis.

* Typographical Symbol: In some cases, four periods might be a typographical symbol for a different purpose, such as representing a pause in a musical score.

However, using four periods at the end of a sentence as a regular sentence punctuation is not standard usage in English.

A single period (.) is the standard punctuation mark at the end of a declarative sentence.