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 Eminent Prominence (disambiguation)