Those pesky Abbreviations!

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The pound and the ounce were used in UK shops until 2000.

These are abbreviated to lb and oz respectively.

Have you ever wondered about the origins of these untypical abbreviations?

No idea.

But "pound" of course reminds me the british currency: Pound, Shilling, Pence...
I've been in London once (some 30 yrs ago) and there were Shillings! 😱

lb seems to be connected to currency it seems...
 
The pound was divided into twenty shillings or 240 pennies. The shilling was subdivided into twelve (12) pennies. The penny was further sub-divided into two halfpennies or four farthings (quarter pennies). There was also the guinea which was = £1-1s-0d ( £1/1/- ) = one pound and one shilling = 21 shillings. A third of a guinea equalled exactly seven shillings. I'll leave the even more simple other subdivisions like the florin, the crown, the half-crown, the half-sovereign, the half-guinea, the half-groat, the threepenny, the groat and the sixpence away for ease of reading.

Now that is what I call a system. Too bad it was decimalised in 1971 as everyone was handy with it. Those good old days....
 
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The pound was divided into twenty shillings or 240 pennies. The shilling was subdivided into twelve (12) pennies. The penny was further sub-divided into two halfpennies or four farthings (quarter pennies). There was also the guinea which was = £1-1s-0d ( £1/1/- ) = one pound and one shilling = 21 shillings. A third of a guinea equalled exactly seven shillings. I'll leave the even more simple other subdivisions like the florin, the crown, the half-crown, the half-sovereign and the half-guinea away for ease of reading.

Now that is what I call a system.

Did cash registers do these calculations? What did the display look like?
 

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Yes, jean-paul, lb is an abbreviation of the Latin word libra. The primary meaning of libra was balance or scales (as in the astrological sign), but it also stood for the ancient Roman unit of measure libra pondo, meaning "a pound by weight."
 
It was the same here but then only for mass/weight. It was abolished in 1869 but stayed .... called pond and being 500 gram. The ounce was also abolished but also stayed as ons (100 gram).

One definitely needs these in 2021 when buying cheese or meat. Ordering a pond kaas is normal, ordering 2 pond kaas will get one corrected to "oh 1 kilo".
 
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The pound was divided into twenty shillings or 240 pennies. The shilling was subdivided into twelve (12) pennies. The penny was further sub-divided into two halfpennies or four farthings (quarter pennies). There was also the guinea which was = £1-1s-0d ( £1/1/- ) = one pound and one shilling = 21 shillings. A third of a guinea equalled exactly seven shillings. I'll leave the even more simple other subdivisions like the florin, the crown, the half-crown, the half-sovereign, the half-guinea, the half-groat, the threepenny, the groat and the sixpence away for ease of reading.

Now that is what I call a system. Too bad it was decimalised in 1971 as everyone was handy with it. Those good old days....

There was also a half farthing and a quarter farthing - I've got the whole lot in a collection (never was a coin collector, just that they issued a set of old coins at the time of decimalisation and I added to it).

So 4,032 quater farthings to 1 guinea.