Two types of symmetry are most often employed in interfaces: vertical axial symmetry (symmetry along a vertical line, usually drawn down the middle of a group of elements) or diagonal axial symmetry (symmetry along a diagonal line).

• 界面中常用到两种对称，即垂直轴对称（沿一根垂直线对称，此线常位于一组元素的中央）或对角线对称（沿对角线对称）。