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| Chinese | English |
| 关于平面的对称 | mirror symmetry |
| 关于平面的对称 | symmetry with respect to a plane |
| 切平面 | tangent plane |
| 密切平面 曲线的 | osculating plane of a curve |
| 对称平面 | plane of symmetry |
| 平面束 | sheaf of plane |
| 平面角 | plane angle |
| 平面角 | angle between two straight lines |
| 球面平均值方向 | spherical mean direction |