What does "ms" stand for in the term loc_physical_ms track value?

[Linhua Gao]

Hi team,

In the term loc_physical_ms track value, what does "ms" represent? Is it an abbreviation for "most specific," indicating the most specific location?

Second question: 

I noticed that there is a track value called loc_interest_ms, which represents the geographic location of user interest. Why is the parameter loc_interest_ms added to the tracking URL? What is the purpose of including it in the tracking URL, and what effect does it have? Is loc_interest_ms equivalent to the campaign target location?

Thanks,

Linhua