import only \mathvisiblespace from stix without importing the whole stix

Question

Continuing How to use only selected math symbols of the STIX fonts?, how to import the normal symbol \mathvisiblespace from stix (or from some other suitable font)? The following attempt gives a different symbol. What am I doing wrong?

\documentclass{article}
\makeatletter
\DeclareFontEncoding{LS2}{}{\@noaccents}
\makeatother
\DeclareFontSubstitution{LS2}{stix}{m}{n}
\DeclareSymbolFont{symbolsstix}{LS2}{stixex}{m}{n}
\DeclareMathSymbol{\mathvisiblespace}{0}{symbolsstix}{"B6}
\begin{document}
\(\{0,1,\mathvisiblespace\}\)
\end{document}

Answer 1

You're using the wrong font.

\documentclass{article}

\DeclareFontEncoding{LS1}{}{}
\DeclareFontSubstitution{LS1}{stix}{m}{n}
\DeclareSymbolFont{symbolsstix}{LS1}{stixscr}{m}{n}
\SetSymbolFont{symbolsstix}{bold}{LS1}{stixscr}{b}{n}
\DeclareMathSymbol{\mathvisiblespace}{0}{symbolsstix}{"B6}

\begin{document}

\(\{0,1,\mathvisiblespace\}\)

\end{document}

If you don't need bold math, a simpler strategy will do as well.

\documentclass{article}
\usepackage{amsmath}

\DeclareFontEncoding{LS1}{}{}
\DeclareFontSubstitution{LS1}{stix}{m}{n}
\DeclareRobustCommand{\mathvisiblespace}{%
  \mathord{\text{\usefont{LS1}{stixscr}{m}{n}\symbol{"B6}}}%
}

\begin{document}

\(\{0,1,\mathvisiblespace\}\)

\end{document}

For a command that obeys \boldmath, see https://tex.stackexchange.com/a/236903/4427

\documentclass{article}
\usepackage{amsmath,pdftexcmds}

\DeclareFontEncoding{LS1}{}{}
\DeclareFontSubstitution{LS1}{stix}{m}{n}
\DeclareRobustCommand{\mathvisiblespace}{%
  \mathord{\text{\usefont{LS1}{stixscr}{\normalorbold}{n}\symbol{"B6}}}%
}
\makeatletter
\newcommand{\normalorbold}{%
  \ifnum\pdf@strcmp{\math@version}{bold}=\z@\bfdefault\else\mddefault\fi
}
\makeatother

\begin{document}

\(\{0,1,\mathvisiblespace\}\)

{\boldmath\(\{0,1,\mathvisiblespace\}\)}

\end{document}