  As a low-energy effective theory on non-symmorphic lattices, we consider a
generic triple point fermion Hamiltonian which is parameterized by an angular
parameter $\lambda$. We find strong $\lambda$ dependence in both Drude and
interband optical absorption of these systems. The deviation of the $T^2$
coefficient of the Drude weight from Dirac/Weyl fermions can be used as a quick
way to optically distinguish the triple point degeneracies from the Dirac/Weyl
degeneracies. At the particular $\lambda=\pi/6$ point, we find that the
"helicity" reversal optical transition matrix element is identically zero. But
deviating from this point, the helicity reversal emerges as an absorption
channel.
