12月的英文缩写为Dec。

12月作为一年中的最后一个月，它的英文缩写是由月份的英文名称December (十二月)的前三个字母组成的。

英文中，每个月份都有相应的缩写形式，如Jan表示1月，Feb表示2月，依此类推，除了Sept（九月）缩写为Sep外，其余月份的缩写均为前三个字母。

掌握每个月份的英文缩写，有助于提高日常英语沟通的效率和准确性。

1. Dec - December

2. Xmas - Christmas

3. NYE - New Year's Eve

4. DAO - December Awareness Month (for various awareness campaigns)

5. CCME - Conference on Climate Change, Mitigation and Adaptation in Canada (usually held in December)

6. DJIA - Dow Jones Industrial Average (stock market index)

7. UCS - Universal Children's Day (celebrated on December 20th)

8. WSJ - Wall Street Journal (financial newspaper)

9. UNFCCC - United Nations Framework Convention on Climate Change (international treaty)

10. CDC - Center for Disease Control (health organization)

11. SAD - Seasonal Affective Disorder (a type of depression that occurs during winter months)

12. PPD - Postpartum Depression (a type of depression that occurs after childbirth)。