GNU Info

(latex.info)\centering

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Up: center

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Enter node , (file) or (file)node

\centering
..........

   This declaration corresponds to the `center' environment.  This
declaration can be used inside an environment such as `quote' or in a
`parbox'.  The text of a figure or table can be centred on the page by
putting a `\centering' command at the beginning of the figure or table
environment.

   Unlike the `center' environment, the `\centering' command does not
start a new paragraph; it simply changes how LaTeX formats paragraph
units.  To affect a paragraph unit's format, the scope of the
declaration must contain the blank line or `\end' command (of an
environment like quote) that ends the paragraph unit.