local_abbreviations

contains a local abbreviation (…) which may be unfamiliar to travelers or newcomers to the local area.

An uppercase 2–6 letter token in <description>, <instruction> or <areaDesc> that isn't a standard acronym (US federal agencies, state codes, cardinal directions, time units) may be meaningless to a traveler or newcomer — e.g., an abbreviation like "JCOES" may mean nothing to people from outside the county that uses it daily. The standard list errs toward under-flagging: a real place name, a common English word capitalized for emphasis, a Roman numeral, or a publisher's own product code (SVRPAH, NWSGSP) are all filtered out first.