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Command-variants followed by a *, like \section*. These variants act as an alternative to the original command, with conditioning through \if@star or other means. For example, xparse defines a starred variant by means of an "optional argument":

\usepackage{xparse}% http://ctan.org/pkg/xparse
\NewDocumentCommand{\engl}{s o m}{%
  % #1 = *
  % #2 = optional
  % #3 = mandatory
}
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