User name

From Neo Mechanica

Seriously? You don't know what a user name is? SERIOUSLY? It's basically an alias that you use while here on the forum. For privacy reasons, we use user names rather than actual, real-life names. However, your user name can be your real life name if you choose. The most important thing is that your user name is what you want others to call you and what you want to refer to yourself as. Read the rules for more info.