Well known or Well-known is a phrase used in several technical contexts: * Well-known ports, port number in the range from 0 to 1023 * Well-known text representation of coordinate reference systems, text markup language for representing coordinate reference systems * Well-known text representation of geometry, text markup language for representing vector geometry objects * Well-known trade mark, a status granted to famous international trade marks * Well-known URIs, web services that use /.well-known/ URIs

See also