By international convention, lb is a unit of measure and thus does not have a plural. So stricly speaking it is incorrect to write 10 lbs; it should be 10 lb without the 's'. This rule applies to all units of measure as, for example, gram whose symbol is 'g'; you wouldn't write 'gs' for grams.
The word “pound” comes from the Latin word pendere, meaning “to weigh”. The Latin word libra means “scales, balances" and it also describes a Roman unit of mass similar to a pound. This is the origin of the abbreviation “lb” for the pound. The “s” at the end of “lbs” simply denotes the plural form.
hi im doing a report on lb. and pounds i think the word comes from the latin word libra which is also the name of a costilation . the constilation is af a scale .( my teacher sad this is to complicated for me since im only in 6th grade.)
The word pound and its abbreviation "lb" comes from latin words "libra pondo"
Where as what previous posts said that it is said when weighted scale is balanced. The abbreviation is used globally as "lb", whereas the pondo is used and translated to "pound" in US.
Later, the word "pound" is widely known and spread globally, but the abbreviation remain unchanged.