Convert the point $\left( 6 \sqrt{3}, \frac{5 \pi}{3}, -2 \right)$ in cylindrical coordinates to rectangular coordinates.
Given cylindrical coordinates $(r,\theta,z),$ the rectangular coordinates are given by
\[(r \cos \theta, r \sin \theta, z).\]So here, the rectangular coordinates are
\[\left( 6 \sqrt{3} \cos \frac{5 \pi}{3}, 6 \sqrt{3} \sin \frac{5 \pi}{3}, -2 \right) = \boxed{(3 \sqrt{3}, -9, -2)}.\]