A symmetry combining reflection in a plane with translation parallel to that plane. An glide translates by half an period, and a glide by half a period. Specifying the reflection trace alone loses the translation and can falsely suggest an ordinary mirror.
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A **glide plane** is a concept primarily used in the field of crystallography and materials science, particularly in the study of crystallographic defects such as dislocations. In simple terms, a glide plane is a specific plane within a crystal lattice along which dislocations can move. In the context of slip systems, glide planes play a crucial role in plastic deformation of materials.