What does RAW actually mean?

I have seen this term before and understand it means PnP rules or something like that, but what does it actually stand for? Some kind of acronym or something entirely unrelated?

Tried a search and came up zilch.

 

Rules As Written

 

Thanks BC. I figured it was something like that, just was not sure of the exact definition. Now my puny brain can empty out its cache so it can process the next dilemma.