How to typeset in LaTex barbed wire brackets as used to denote paramorphism in the paper "Functional Programming with Bananas, Lenses, Envelopes and Barbed Wire"?
Using answers to this question I was able to come up with:
\DeclareMathOperator{\lbarb}{\mathrel{\ooalign{\hss(\hss\cr\{}}}
\DeclareMathOperator{\rbarb}{\mathrel{\ooalign{\hss)\hss\cr\}}}}