Familiar, famous, renowned, noted or widely known.
Edward Churchill still attended to his work in a hopeless mechanical manner like a sleep-walker who walks safely on a well-known round. But his Roman collar galled him, his cossack stifled him, his biretta was as uncomfortable as a merry-andrew's cap and bells.
From Middle English well knowen. By surface analysis, well + known.
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Generally recognized; reserved for some usual purpose.
We would like to catalog other sockets which are supposed to be well-known