Je pense que c'est la forme `starburst` que vous cherche.
cherchez.
Essayer `\node[draw,starburst, starburst points=6, starburst point height=2cm,text width=1.5cm] (C) at (0,0) {Conflits d’usage};`
ou `\node[draw,starburst, starburst points=6, text width=1.5cm] (C) at (0,0) {Conflits d’usage};`
**ECM**
\documentclass[french,a4paper,12pt]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{babel}
\usepackage{tikz}
\usetikzlibrary{shapes} % bibliothèque de formes (noeuds tikz)
\begin{document}
\begin{tikzpicture}
% Déf. styles
\tikzstyle{quadri}=[rectangle,draw,fill=yellow!50,text=blue]
\tikzstyle{estun}=[->,>=latex]
% Noeuds
\node[draw,starburst, starburst points=7, starburst point height=2cm,text width=1.5cm] (C) at (0,0) {Conflits d’usage};
\end{tikzpicture}
\end{document}
