It means 'Original Poster', and is pretty common in for example Usenet (where you have a thread starting potentially with an anonymous question). For a complete list of Stack Exchange terms, see Stack Exchange Glossary - Dictionary of Commonly-Used Terms.


I don't consider this an issue, since people who see that message are already on this site. The suggestion is not "Go to TeX.SX" or "Visit TeX.SX". As an aside: For those posting Welcome to TeX.SX! verbatim as a comment, they could consider changing this to Welcome to TeX.SE! as the .SE suffix is more commonly used to represent the Stack Exchange ...


In addition to "original poster," it is also sometimes used to mean "original post," with the assumption that you can tell which is meant based on the context.

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