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The pound or pound-mass is a unit of mass used in both the British imperial and United States customary systems of measurement.Various definitions have been used; the most common today is the international avoirdupois pound, which is legally defined as exactly 0.453 592 37 kilograms, and which is divided into 16 avoirdupois ounces. [1]
The symbol derives from the upper case Latin letter L, representing libra pondo, the basic unit of weight in the Roman Empire, which in turn is derived from the Latin word libra, meaning scales or a balance. The pound became an English unit of weight and in England became defined as the tower pound (equivalent to 350 grams) of sterling silver.
The symbol # is known variously in English-speaking regions as the number sign, [1] hash, [2] or pound sign. [3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔ .
For example, 2 pounds 14 shillings and 5 pence could have been written as £2 14s 5d or £2/14/5. The origin of £/ L {\displaystyle {\mathfrak {L}}} , s, and d were the Latin terms Libra, meaning a pound weight (with the £ sign developing as an elaborate L), solidus (pl. solidi), 20 of which made up one Libra, and denarius (pl. denarii), 240 ...
"current": AC (for "alternating current"); less commonly, DC (for "direct current"); or even I (the symbol used in physics and electronics) Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI; The name of a chemical element may be used to signify its symbol; e.g., W for tungsten
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The weights are in denominations of 7 pounds (corresponding to a unit known as the clip or wool-clip), 14 pounds (stone), 56 pounds (4 stone) and 91 pounds (1 ⁄ 4 sack or woolsack). [ 18 ] [ 19 ] The 91-pound weight is thought to have been commissioned by Edward III in conjunction with the statute of 1350, while the other weights are thought ...
In describing paper, the pound is often symbolized by the pound symbol, #. Because of the difference in the way pound weight is determined, a sheet of 65# card stock is thicker and heavier than a sheet of 80# newsprint. The weight of cardstock ranges from 50# to 110# (about 135 to 300 g/m 2). [2]