%Hi,
%the \langle \rangle are used extensively in CSP formal notation.
%Would I be correct in thinking, based on the identifier names, that they draw something similar to the <> symbols?
\documentclass [a4paper, 12pt] {article}
\usepackage {amssymb}
\begin {document}
$\langle a, b \rangle$
\end {document}
%Thanks, Paul