The chemical formula NF of nitrogen trifluoride is a colorless, odorless and stable gas at room temperature, and it is a strong oxidant.

All the macroscopic symmetry element contained in a crystal intersect at least at one point, and all the symmetry element converge at one point, which is called the point group of the crystal. Point groups are usually used for mathematical analysis of crystals. When a crystal has multiple symmetry element, these symmetry element must pass through a common point, and the corresponding symmetry operations are all point operations.