## \begin

The LaTeX command used with \end to delimit an environment within which the text is formatted in a certain way. E.g. \begintable...\endtable.

Used humorously in writing to indicate a context or to remark on the surrounded text. For example:

 \begin{flame}
Predicate logic is the only good programming
language.  Anyone who would use anything else
is an idiot.  Also, all computers should be
\end{flame}