The most common form of an ellipsis is a row of three periods or full stops (...) or a precomposed triple-dot glyph (...). The usage of the em dash (--) can overlap the usage of the ellipsis, especially in dialogue. Style guides often have their own rules governing the use of ellipses. For example, The Chicago Manual of Style recommends that an ellipsis be formed by typing three periods, each with a space on both sides (...). Whether or not an ellipsis at the end of a sentence needs a fourth dot to finish the sentence is a matter of debate; for example, Chicago advises it, but the OxfordWords blog has suggested that a full stop is considered to be paradoxical to an ellipsis used to indicate an incomplete thought, so it is omitted.

What are the dots after a sentence called? Let's have some stream of consciousness first.
To answer this question, we should know that: The most common form of an ellipsis is a row of three periods or full stops (...) or a precomposed triple-dot glyph (...). So, the answer is an ellipsis.