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#0 is often used as a reference to the topic, on forums where posts in thread are numbered.
The first posts has #0, the first reply has #1 and so on.
Many forums have a "quote" function, where the actual text you want to quote on is shown.
If this is not the case, #number is used to refer to a specific post.

In some rare cases, when a posts is deleted, the numbering will automatically try to fix the order, which can be messy if a user has made a reference to a post that is deleted, and thus refering to something that doesn't make any sense.
- #0 speaks the truth!
- I agree on what #3 said, but #8 is all wrong.
by Fizk April 29, 2008
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