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: Globally unique codes assigned to specific geographical locations.

You can find the official key to these prefixes exclusively in the DOC 7910 PDF. doc 7910 pdf

This is the most referenced section. It lists four-letter indicators alphabetically by the first letter (which denotes a geographical region, known as the ICAO regional prefix). For example: : Globally unique codes assigned to specific geographical

Have you ever wondered how an aircraft leaving Tokyo knows exactly how to route itself to London without getting lost in a sea of overlapping names? Passengers know airports by their three-letter IATA codes (like LHR for Heathrow). But behind the scenes, pilots, dispatchers, and air traffic controllers speak a different, highly structured language. It lists four-letter indicators alphabetically by the first

Identifying facilities and reporting points.

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