A location identifier is a symbolic representation for the name and the location of an airport, navigation aid, or weather station, and is used for manned air traffic control facilities in air traffic control, telecommunications, computer programming, weather reports, and related services.
Read more about Location Identifier: ICAO Location Indicator, IATA Identifier, FAA Identifier, Transport Canada Identifier, WMO Station Identifiers, United States Weather Agency Identifiers, Transplanted Identifiers