O (EN)

字母，名词，词素，专有名词，符号

字母 “O”

1. 字母“o”的大写形式
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   Olivia wrote her name with a big "O" at the beginning.

名词 “O”

1. 缺乏A型或B型抗原的血型
   Since she has type O blood, she can only receive donations from others with the same type.
2. 高潮的俚语
   After months of trying, she finally experienced her first O with her partner.
3. 鸦片的俚语
   He pulled out a small pouch and whispered, "Got some O if you're looking to relax."

词素 “O”

1. 哦
   O Captain! My Captain! Our fearful trip is done.

专有名词 “O”

1. 欧（韩国或中国的姓氏）
   Mrs. O, originally from Seoul, is known for her delicious kimchi recipe.

符号 “O”

1. 氧气的符号
   Water is composed of two hydrogen atoms and one oxygen atom, represented chemically as H2O.
2. 大O（表示一类函数被特定函数上界渐近约束）
   In algorithm analysis, if we say a sorting algorithm is O(n log n), it means its time complexity will not grow faster than n log n times some constant, for large enough n.
3. O（表示正交群）
   In our study of symmetries, we learned that the set of rotations and reflections of a square forms an orthogonal group, denoted as O(2).