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troy ounce

トロイオンス ／ troy-ounce　—　Measuring

A unit for weighing precious metal. One troy ounce is about 31.1 grams.

400 troy ounce 995.5 gold bar (National Bank of Poland Money Centre) 400 troy ounce 995.5 gold bar (National Bank of Poland Money Centre)Photographed in 2016
A photograph of the real thing this term names.

This is different from the Avoirdupois ounce (approx. 28.35 grams) used in cooking and other contexts. ⚠ If you convert the "ounce" found in historical sources without confirming which type it is, the result will be off by ten percent.