Ah, I get it now. Rather then post a question to the person who authored the spreadsheet I must use google to derive the answers to all questions related to said spreadsheets. That will be fun since user A may use a term that user B does not.
Thanks for the enlightment.... you do live up to the guild title.
"MP5" is not a particularly mystified term, and as I've said twice now, the original infraction was mostly for your horrid mangling of the English language.