\begin{tikzpicture}

% draw D-branes
\draw[thick] (0.2cm, -0.3cm) -- (4.1cm, 3.1cm) node[anchor=west] {$D_{(1)}$};
\draw[thick] (4.5cm, -0.4cm) -- (1cm, 2.4cm) node[anchor=east] {$D_{(2)}$};
\draw[thick] (0cm, 0cm) -- (5cm, 0cm) node[anchor=north west] {$D_{(3)}$};

% draw angles
\draw[dashed, ->] (1.25cm, 0cm) arc (0:45:0.6cm);
\draw[dashed, <-] (4.4cm, -0.3cm) arc (320:360:0.6cm);
\draw[dashed, <-] (2.7cm, 1.05cm) arc (-50:50:0.6cm);

% draw names
\node[anchor=north] at (1.25, 0cm) {$n_{0}^3 > 0$};
\node[anchor=south west] at (4.5cm, 0cm) {$n_{1}^3 < 0$};
\node[anchor=north west] at (2.9cm, 1.85cm) {$n_{\infty}^3 > 0$};

\end{tikzpicture}

% vim: ft=tex