User's username in posts

Hello, what is the code thing for the user's username in the post (e.g. If I was viewing the topic, the post will have my name in it, and to other users, it says their name instead)? I found it a few weeks ago, but forgot to save it (I found it on a topic, which I can't find either). And I'm sure I weren't dreaming...

Sorry, but it's quite hard to explain what I mean.

{ U S E R N A M E }

With no spaces.

Thank you very much, it works.

Since this thread is marked solved, I will lock this thread.


Sanket