0000 may refer to:
- the year 10,000 problem
- a null train reporting number or headcode
- a suffix to a time indicating Coordinated Universal Time, rather than a local time zone
- the null character
- Midnight in 24-hour clock
This disambiguation page lists articles associated with the same number.
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If an internal link led you here, you may wish to change the link to point directly to the intended article.