The moth-shaped single crystals of trigonal poly(oxymethylene) consisting of extended chains (ECC) were obtained by the thermal phase transition of single crystals of orthorhombic poly(oxymethylene) having the same crystal habits. Polarized Raman spectra of the trigonal poly(oxymethylene) single crystals have been taken by means of the microprobe technique. Ordinary right-angle polarized Raman spectra have been measured on pressurized superdrawn filaments of trigonal poly(oxymethylene) having high transparency and ECC-type crystal morphology. Assignments of the Raman-active modes including the E2 vibrations, which mostly remain unassigned so far, have been performed on the basis of the observed polarizations. The E1(7) and E1(8) modes exhibit the LO (longitudinal optic)-TO (transverse optic) splitting characteristic of the noncentrosymmetric crystal lattice. In order to confirm the splittings, the angular dispersion of the LO component has been measured.