Curly brace with a bar next to it

Question

I'm trying to work out if there's a symbol for this, or if my hack will have to do.

What I'd like to achieve is a symbol identical to the curly braces with a bar here:

But the closest I can seem to get is this:

which clearly leaves a small space, as it's actually just

\{\!|\ Term\ |\!\}

I've tried to draw it into detexify but it's not come up with anything. (The top screenshot is from a LaTeX PDF, but I can't find the .tex file for it anywhere unsurprisingly.)

Any help or suggestions much appreciated!

Answer 1

Here a simple MWE to obtain what you want

\documentclass{article}

\newcommand{\lbbar}{\{\kern-0.5ex|}
\newcommand{\rbbar}{|\kern-0.5ex\}}

\begin{document}

\[ \lbbar \ Term\ \rbbar^A_{Term} \]

\end{document}

If you want to make yours brackets stretchable, you can use the scalerel package which provide \stretchleftright command, it can be used like this:

\documentclass{article}
\usepackage{scalerel}

\newcommand{\lbbar}{\{\kern-0.5ex|}
\newcommand{\rbbar}{|\kern-0.5ex\}}

\begin{document}

\[\stretchleftright{\lbbar}{\displaystyle\sum_{i=1}^n i}{\rbbar}\]

\end{document}

Which gives