LaTeX
In the typesetting language LaTeX, an asterism can be defined as a command by inserting something similar to the code below in the LaTeX document's ‘preamble’:
\newcommand{\asterism}{{\footnotesize \smash{% \raisebox{-.2ex}{% \setlength{\tabcolsep}{0.5pt}% \begin{tabular}{@{}cc@{}}% \multicolumn2c*\\ *&*% \end{tabular}}}}}An asterism can then be inserted in the body of a document by using the \asterism command.
Read more about this topic: Asterism (typography)