### **Symmetry** * * * * * **Description**： If a symmetric constraint is imposed, define a line (two-dimensional) or a plane (three-dimensional) as the axis of symmetry or face. (This component must be used after generating the mesh.) **Input**： Sym: Enter the axis of symmetry (two-dimensional) or the plane of symmetry (three-dimensional). Tol: Tolerance value. **Output**： Syms: Symmetric constraint.