I am typing article on overleaf, I want to have access to \symrm (for example to write \symrm{\pi}}.
Everytime I write usepackage{unicode-math} error appears indicating to use lualatex or xetex instead.
Can you provide your input on this problem? For example how to obtain \symrm{\pi} ?
(We are following the not so short introduction to latex, \symrm was used over there).