xkeyval Error: `HEIGHT' ('WIDTH') undefined in families `psvectorian'

Question

I'd like to change the title of my glossary, say, List of Symbols, as follows (using some entities borrowed from the psvectorian package).
hfilhspace*{-3.5cm}psvectorian[height=3mm, width=8cm]{88}hfil[baselineskip]List of Symbols[0.9baselineskip]hfilhspace*{-3.5cm}psvectorian[height=3mm, width=8cm]{88}hfil

Here is my MWE
documentclass{memoir}

usepackage{psvectorian}
usepackage[english]{babel}
usepackage{tikz}
usepackage{tocloft}
usepackage{glossaries}
usepackage{fontspec}

renewcommand*glspostdescription{dotfill}

newcommand{abc}[1]{hfilhspace*{-3.5cm}psvectorian[height=3mm, width=8cm]{88}hfil[baselineskip]#1[0.9baselineskip]hfilhspace*{-3.5cm}psvectorian[height=3mm, width=8cm]{88}hfil}

loadglsentries{gloss-symb}

newglossarystyle{mylong}{%
    setglossarystyle{long}%
    renewenvironment{theglossary}%
    {begin{longtable}[l]{@{}p{dimexpr 2.5cm-tabcolsep}p{0.8hsize}}}
        {end{longtable}}%
}

makenoidxglossaries

begin{document}

tableofcontents
    
    clearpage
    
    renewcommand{glossaryname}{abc{List of Symbols}}
    
        addcontentsline{toc}{chapter}{List of Symbols}
        printnoidxglossary[style=mylong]

newpage
    
    gls{sigma} is an event set.
end{document}

in which gloss-symb.tex just includes
newglossaryentry{sigma}{name={ensuremath{Sigma}}, description={Event set}}

However, I've faced the following errors:
Package xkeyval Error: `HEIGHT' undefined in families `psvectorian'. end{document}

Package xkeyval Error: `WIDTH' undefined in families `psvectorian'. end{document}

The psvectorian manual (the page 2) already noted that width and height are indeed valid keys. So, what am I doing wrong here?

Phelype Oleinik · Accepted Answer

width and height do in fact exist, but WIDTH and HEIGHT do not.  The problem is that at some point when typesetting glossaryname the macro is expanded and MakeUppercased, so width becomes WIDTH and you get the error.  This is the problem of intermixing code (psvectorian and such) with text:  some code that expects pure text will not behave well with general commands.
One easy way out is to pack the psvectorian commands into protected macros so that they don't expand before uppercasing (thus they aren't uppercased either).  Dividing your definition of abc into three parts gets the job done:
protecteddefabcbefore{hfilhspace*{-3.5cm}psvectorian[height=3mm, width=8cm]{88}hfil[baselineskip]}
protecteddefabcafter{[0.9baselineskip]hfilhspace*{-3.5cm}psvectorian[height=3mm, width=8cm]{88}hfil}
newcommand{abc}[1]{abcbefore#1abcafter}

Compilable code:
documentclass{memoir}
usepackage{psvectorian}
usepackage{glossaries}

begin{filecontents*}{gloss-symb}
newglossaryentry{sigma}{name={ensuremath{Sigma}}, description={Event set}}
end{filecontents*}

renewcommand*glspostdescription{dotfill}

protecteddefabcbefore{hfilhspace*{-3.5cm}psvectorian[height=3mm, width=8cm]{88}hfil[baselineskip]}
protecteddefabcafter{[0.9baselineskip]hfilhspace*{-3.5cm}psvectorian[height=3mm, width=8cm]{88}hfil}
newcommand{abc}[1]{abcbefore#1abcafter}

loadglsentries{gloss-symb}

newglossarystyle{mylong}{%
    setglossarystyle{long}%
    renewenvironment{theglossary}%
    {begin{longtable}[l]{@{}p{dimexpr 2.5cm-tabcolsep}p{0.8hsize}}}
        {end{longtable}}%
}

makenoidxglossaries

begin{document}

tableofcontents

clearpage

renewcommand{glossaryname}{abc{List of Symbols}}

addcontentsline{toc}{chapter}{List of Symbols}
printnoidxglossary[style=mylong]

newpage

gls{sigma} is an event set.
end{document}

xkeyval Error: `HEIGHT' ('WIDTH') undefined in families `psvectorian'

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