\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{shapes.symbols}
\begin{document}
\begin{tikzpicture}
\node[draw,cloud,cloud puffs=4,cloud puff
arc=31.4,align=center,label={[anchor=north]above:$\pi$}]{text here};
\end{tikzpicture}
%%%%%% vvvvv Not use paramters in tikzpicture, like ^^^^^^^^^^^^^
\begin{tikzpicture}[pi cloud/.style={draw,cloud,cloud puffs=4,cloud puff
arc=31.4,align=center,label={[anchor=north]above:$\pi$}}]
\node[pi cloud,path picture={\node[anchor=north east]
at (path picture bounding box.north east){t};}]