O

1.[c][u]英语字母表的第 15 个字母the 15th letter of the English alphabet

2.（说电话号码等时表示）零used to mean ‘zero’ when saying telephone numbers, etc.

1.哦

1.英语字母表第十五字母

2.一系列中之第十五

3.O字形物;圆

4.【数】零

1.the 15th letter of the English alphabet. O is a vowel.

2.a common blood type in the ABO system

3.a way of saying “zero,” used for example when you are telling someone a telephone number or saying a date such as 1904

1.used in poetry for addressing someone or something

2.another way of writing “oh”