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Question 159·Hard·Words in Context

The art historian considers the small triangular stamp on a ceramic bowl a ______ marker of manufacture at the Luma workshop. The mark appears on many documented Luma pieces, and scans show that it was impressed before firing. Yet Luma’s account books record sales of “retired triangles” to neighboring potters, whose inventories identify these items as reusable stamp molds.

Which choice completes the text with the most logical and precise word or phrase?