Each locality commonly uses its own abbreviations for the various types of zoning. Ffor example, in one place, “R1” zoning might indicate a “residential” zone, and in another, “R1” might describe a “rural” zone.
Also, some locations have “cumulative zoning” schemes, which allow any use that’s considered less harmful or impactful than the zoned use. For example, industrial zones might rank as the highest impact, with commercial use next, and residential zones the lowest impact. So if you’re really eager to build a home in an industrial area, cumulative zoning might allow you to do so.
Don’t count on this system existing in all areas, however. Another location might not use cumulative zoning, and instead only allow the exact use specified by the designated zone.