Rather than argue about whether it is a defined term or not lets accept it is becoming code language (or not) and address the question. Is the question ambiguous because of the terminology? If that answer is yes then I appreciate the point of defining the term in a particular way. I think every one in the discussion knows what is being asked here.
I have just looked at the Bussmann downloadable Short Circuit Calculation software, it does not use this acronym.
Proper usage of acronyms and terms is very important. There are many questions that are answered inappropriately because the parties mis-understand the terms being used.
