International
Tables for Crystallography Volume A Spacegroup symmetry Edited by M. I. Aroyo © International Union of Crystallography 2016 
International Tables for Crystallography (2016). Vol. A, ch. 2.1, p. 145

^{†}In the rhombohedral spacegroup symbols (161) and (167), the symbol c refers to the description with `hexagonal axes'; i.e. the glide vector is , along [001]. In the description with `rhombohedral axes', this glide vector is , along [111], i.e. the symbol of the glide plane would be n: cf. Table 1.5.4.4
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^{‡}Glide planes `e' occur in orthorhombic A, C and Fcentred space groups, tetragonal Icentred and cubic F and Icentred space groups. The geometric element of an eglide plane is a plane shared by glide reflections with perpendicular glide vectors, with at least one glide vector along a crystal axis [cf. Section 1.2.3 and de Wolff et al. (1992)]. ^{§}Glide planes d occur only in orthorhombic F space groups, in tetragonal I space groups, and in cubic I and F space groups. They always occur in pairs with alternating glide vectors, for instance and . The second power of a glide reflection d is a centring vector. ^{¶}Only the symbol m is used in the Hermann–Mauguin symbols, for both point groups and space groups. ^{††}The inversion point is a centre of symmetry if n is odd. 