thumb|Irish gold pistole, bearing its weight (4 dwt 7 gr) ([[National Museum of Ireland – Decorative Arts and History)]] A pennyweight (dwt) is a unit of mass equal to 24 grains, of a troy ounce, of a troy pound, avoirdupois ounce and exactly 1.55517384 grams. It is abbreviated dwt, d standing for denarius (an ancient Roman coin), and later used as the symbol of an old British penny (see £sd).
thumb|Irish gold pistole, bearing its weight (4 dwt 7 gr) ([[National Museum of Ireland – Decorative Arts and History)]] A pennyweight (dwt) is a unit of mass equal to 24 grains, of a troy ounce, of a troy pound, avoirdupois ounce and exactly 1.55517384 grams. It is abbreviated dwt, d standing for denarius (an ancient Roman coin), and later used as the symbol of an old British penny (see £sd).
==History== In the Middle Ages, an English penny's weight was literally, as well as monetarily, of an ounce and of a pound of sterling silver. At that time, the pound unit in use in England was the Tower pound, equal to 7,680 Tower grains (also known as wheat grains). The medieval English pennyweight was thus equal to 32 Tower grains. When Troy weights replaced Tower weights in 1527, the Troy weights were defined in such a way that the old Tower pound came out to exactly 5,400 Troy grains (also known as barleycorns), the Tower pennyweight Troy grains (and thus approximately 1.46 grams). After 1527, the English pennyweight was the Troy pennyweight. of 24 Troy grains. Thus the Troy pound, ounce, and pennyweight, with their definitions given in terms of the Troy grain instead of in terms of the Tower grain, were or 6.667% more than the Tower equivalents.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).