This question already has an answer here:
I am preparing a math document, and would like to use the
\bigtriangleup math operator from the package
stmaryrd. However, calling the entire package is not an option as it overwrites several commands from
mathabx which I am also using. Is there a way I can extract this operator (possibly using a different name, so that
\bigtriangleup binary operator isn't affected) without having to use the package?