Template tags frustration

I've been searching the documentation for any kind of reference, and 
getting quite frustrated trying to figure this out!

Within the Signature templates, there is a very vague statement of "You 
can use any available tags", with a few examples.

The problem is I don't know what those tags are, or how to find them; 
and they are not listed anywhere in the documentation.

All online searches find forum posts, etc that are similarly vague - 
clearly they are referencing assumed knowledge that I simply don't have. 
I have no idea what they're talking about.

Generically, how can I determine the full and *specific* (_EXACT NAMES_) 
list of tags/variables that are available in for use in agent signatures 
and/or other contexts?

Specifically, I am trying to put the agent "Title" from the Edit Agent 
screen in to the agent signatures.

For reference, I'm using OTRS 3.3.11.

Thanks,

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