 otu nime ndị ọcha nke symmetry, ihe axis nke symmetry bụ ihe myiyi akara site etiti nke a crystal, banyere nke crystal nwere ike na-agba gburugburu ka na-ewetara ndị otu ihe ahụ anya 2, 3, 4 ma ọ bụ 6 ugboro otu zuru ezu adiana ie , a yiri ihu enyene a yiri ọnọdụ, ihe karịrị otu ugboro na a zuru ezu adiana 