counter (n.)youdaoicibaDictYouDict
mid-14c., "table where a money lender does business," from Old French contouer, comptoir (14c.) "counting room, table of a bank," from Medieval Latin computatorium "place of accounts," from Latin computatus, past participle of computare (see compute). Generalized 19c. from banks to shops, then extended to display cases for goods. Phrase under the counter is from 1926.
shadow-box (n.)youdaoicibaDictYouDict
protective display case, 1892, from shadow (n.) + box (n.1).