rotational symmetry
A surname.
(obsolete) hardness; firmness / (obsolete) harshness; cruelty
(geometry) The property a shape has when it looks the same after some rotation by a partial turn.
(dated) Alternative form of SF (science fiction) / Abbreviation of significant figure(s).
雪の結晶の回転対称性は、60度回転しても元の輪郭と一致することで明らかになります。
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