\begin{tikzpicture}[baseline=2ex]
\path (0,0) node (T') [shape=rectangle, draw]{\;$T'$\;};
\path (0,1) node (T) [shape=rectangle, draw]{\;$T$\;};

\draw [->] (T'.140) -- (T.220);
\draw [->] (T'.90) -- (T.270);
\draw [->] (T'.40) -- (T.320);
\end{tikzpicture}