drielettercodes
Three-letter codes, or drielettercodes, are standardized identifiers composed of three letters used to refer to entities across a range of domains. They are designed to be compact, mnemonic, and easy to parse in data systems. Many sectors maintain separate code sets that use three-letter codes for different purposes, and there can be overlap between schemes.
In aviation, IATA assigns three-letter airport codes, such as LAX for Los Angeles International and JFK for
In language tagging, ISO 639-2 and related standards use three-letter language codes such as eng for English,
Because many coding systems coexist, the same three-letter sequence can appear in different schemes with different