1 英语字母表的第15个字母 O is the fifteenth letter of the English alphabet. 英语字母表的第15个字母

2 零 O is used to mean zero, for example when you are telling someone a telephone number, or mentioning a year such as 1908. 零

3 See also: oh  （尤用于表示强烈感情）哎呀，啊，唉，哟 O is used in exclamations, especially when you are expressing strong feelings. （尤用于表示强烈感情）哎呀，啊，唉，哟

4 (用于首字母为o的一些单词的缩写，如 old或organization) O is used as an abbreviation for words beginning with o, such as 'old' or 'organization'. (用于首字母为o的一些单词的缩写，如 old或organization)