Claim: Polyhedral symbol has 25 symbols one of which is Trigonal Planar - 3 coordinate.
Evidence: trigonal planar – 3 coordinate TP-3 L-2 A-2 TPY-3 TS-3 linear - 2 coordinate bent - 2 coordinate trigonal pyramidal- 3 coordinate T-shaped- 3 coordinate tetrahedral geometry – 4 coordinate square planar – 4 coordinate square pyramidal– 4 coordinate see-saw– 4 coordinate trigonal bipyramidal- 5 coordinate square pyramidal – 5 coordinate octahedral geometry – 6 coordinate trigonal prismatic -6 coordinate pentagonal bipyramid- 7 coordinate face capped octahedron- 7 coordinate trigonal prism, square face monocapped cubic -8 coordinate square anti prism dodecahedral hexagonal bipyramid octahedron, trans-bicapped trigonal prism, triangular face bicapped trigonal prism, square face bicapped trigonal prism, square face tricapped heptagonal bipyramid HBPY-9 TPRS-9 TPRS-8 TPRT-8 OCT-8 HBPY-8 DD-8 SAPR-8 CU-8 TPRS-7 OCF-7 PBPY-7 TPR-6 OC-6 SPY-5 TBPY-5 SS-4 SPY-4 SP-4 T-4