documentclass{book}
setcounter{secnumdepth}{3} % number subsubsections
setcounter{tocdepth}{3} % put subsubsections in ToC
renewcommand{thesubsubsection}{ensuremath{clubsuit}} % no number, fancy glyph
begin{document}
tableofcontents}
chapter{Chapter}
section{Section}
subsection{Subsection}
subsubsection{Subsubsection}
end{document}