I don't really understand what's going on tbh. ^^ I read something about latex3 and just wanted to write \A onto the pdf with the command \c_backslash_str as described in the documentation, but what I get is something like "A. Anybody can explain to me why? (I use TexStudio, MikTeX, Windows 10, (re)-downloaded both programs today (03.02.2022) and updated 'all' packages on miktex, so there shouldn't be any problems in that regard.)
\documentclass{article}%
\usepackage{expl3}%
\begin{document}%
\ExplSyntaxOn%
\tl_new:c {l_my_tl}%
\tl_set:cn {l_my_tl} {A}%
\tl_put_left:cn {l_my_tl} { \c_backslash_str }%
\tl_use:c {l_my_tl}%
\ExplSyntaxOff%
\end{document}

\usepackage[T1]{fontenc}or\texttt– Phelype Oleinik Feb 03 '22 at 22:20