- quadrantal symmetry
- 象限对称
English-Chinese computer dictionary (英汉计算机词汇大词典). 2013.
quadrantal symmetry
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History of quaternions — This article is an indepth story of the history of quaternions. It tells the story of who and when. To find out what quaternions are see quaternions and to learn about historical quaternion notation of the 19th century see classical quaternions… … Wikipedia
