Davidson County Zoning R1 Duplex?

[Christopher Davis]

Hi, Relatively new to the Nashville area and trying to get educated on common local zoning designations. I'm looking at all the zoning definitions by the county but can't exactly translate them into layman's terms.

What does R6 mean? A lot at 6000 feet that can be subdivided into two lots? What is the minimum size lot at which it can be subdivided? What is a general explanation for the R designations? 

I'm also looking at a duplex that is zoned R1 Duplex but I can't find a definition for this.

Thank you so much for any guidance!