How do I create angular brackets in LaTeX?

You can create angle brackets in math mode with the \langle and \rangle commands, like this:

$\langle x \rangle$

If you would like them in text mode, you can include the textcomp package in your document's preamble as demonstrated in the following example:

\documentclass{article}
\usepackage{textcomp}
\begin{document}

You can write angular brackets in text, like this:  \textlangle x\textrangle.
\end{document}

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This example produces the following output: