The LaTeX command for ellipsis (…) is \dots.
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Write \dots in normal text, outside math mode. It is part of core LaTeX, so no extra package is required.
\dots works both in running text and inside a formula. With XeLaTeX or LuaLaTeX you can also type … directly.
Open this example in the live preview: it renders as you type, with no compiler and no signup.
\texteuro\textyen\dag\ddag\S\P\textbullet-----\textasciitilde\textasciicircum\textbackslash\textasteriskcentered\slashText symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \dots in normal text; it needs no extra package. For example, \dots.
None: \dots is built into LaTeX, so no extra package is required.