Zoning categories and symbols vary among communities. A C-1 zone in one city is not necessarily the same as a C-1 in another. Typically, jurisdictions use letters of the alphabet as code abbreviations to identify the use allowed in a physical geographic area, such as R for residential, C for commercial, and I for industrial. These symbols are usually paired with some number. The number can specify the level of use, or it may indicate a certain amount of acreage or square footage for that particular property.