D₂I₁H₄E₁D₂R₁O₁N₁

13 points

DIHEDRON is validvalid

a figure formed by two intersecting planes [n DIHEDRONS]

64,765 of 196,601 in NWL2023·also valid in CSW24

a flattened double pyramid [n DIHEDRONS or DIHEDRA]

65,236 of 280,887 in CSW24·also valid in NWL2023