What is it called when there are four periods at the end of a sentence? I know what it means but...

Answer 1

The first three are called an ellipsis. The fourth is used when there's an ellipsis at the end of a sentence.

http://grammar.ccc.commnet.edu/grammar/marks/ellipsis.htm

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Answer 2

It's called an ellipsis.

http://dictionary.reference.com/browse/ellipsis