Regular Polygonal Prism
tri-prism on regular grid
regular point and regular repair
Nicol prism(Nicol’s prism)[nicol]
Prism-Grating-Prism(PGP) component
roof prism (=roof-angle prism)
(IC) Completely Regular Separation
(regular) local n-cocycle
(regular) residuated lattice
~*-covered regular semigroup
3-Connccted 3-regular graph