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User:Nilradical
Conway
o
**
*x
xx
Crystal.
p1
pm
cm
pg
Conway
2222
*2222
2*22
22*
22x
Crystal.
p2
pmm
cmm
pmg
pgg
Conway
333
*333
3*3
Crystal.
p3
p3m1
p31m
Conway
442
*442
4*2
Crystal.
p4
p4m
p4g
Conway
632
*632
Crystal.
p6
p6m
Least
rotation
angle
Orientation preserving
(No reflections or glides)
Mirrors meet all glide axes
and centers of rotation
Has independent glides
or centers of rotation
2π
p1
(o)
pm
(**)
Has refections?
Yes
cm
(*x)
No
pg
(xx)
2π / 2
p2
(2222)
pmm
(*2222)
Number of perpendicular reflections
Two
cmm
(2*22)
One
pmg
(22*)
None
pgg
(22x)
2π / 3
p3
(333)
p3m1
(*333)
p31m
(3*3)
2π / 4
p4
(442)
p4m
(*442)
p4g
(4*2)
2π / 6
p6
(632)
p6m
(*632)