Btukfyl

I am trying to include a first circled and then boxed word in a section heading.

Currently, I am only able to create this highlighted word within a normal paragraph, but not inside of a heading. My attempt so far:

documentclass[a4paper]{article}

usepackage{tikz}

newcommand*circled[1]{tikz[baseline=(char.base)]{

        node[shape=circle,draw,inner sep=2pt] (char) {#1};}}

begin{document}

section{Custom fbox{word} in Section heading}

fbox{circled{word}}

end{document}

Which renders like this:

.

Ideally, I want to be able to write something similar to fbox{circled{word}} inside of my section heading, which currently simply throws an error about the "undefined control sequence def.

This is because you command is fragile. Here is a solution:

documentclass[a4paper]{article}

usepackage{tikz}

DeclareRobustCommandcircled[1]{fbox{tikz[baseline=(char.base)]{

        node[shape=circle,draw,inner sep=2pt] (char) {#1};}}}



begin{document}



section{Custom circled{word} in Section heading}



circled{word}



end{document} 

Anything inside sectioning commands must be robust or protected using protect, so you need to change you newcommand to DeclareRobustCommand.

documentclass[a4paper]{article}

usepackage{tikz}

DeclareRobustCommandcircled[1]{tikz[baseline=(char.base)]{

        node[shape=circle,draw,inner sep=2pt] (char) {#1};}}

begin{document}

section{Custom fbox{circled{word}} in Section heading}

fbox{circled{word}}

end{document}