is an abbreviation used to reference metro-rail or light-rail services within a community or city, or on a campus of a large school or business.
is a term used by pilots when describing the place pilots call in for weather and landing information. Mostly a military term, as a civilian pilot might call a Flight Service Station for similar information. Meteo is a similar term.
is an abbreviation used in the RadioReference Database to describe a metropolis area, typically a region within a roughly defined radius of a large city, or group of cities. In the Wiki, current "Metro Area" categories include: