Elastane is the same as Spandex. Both are yarns that are knit/woven into fabrics, and contribute stretch and recovery properties to the fabric. Spandex is DuPontâs brand, elastane is the generic name.
In Latin 'Libra' are the symbol for the scales, hence the use of lb for weight (and lbs for the multiple),
The word 'pound' is short for 'pound weight' which was libra pondo in Latin. The libra part of the phrase meant both weight or balance scales. The Latin usage was shortened to libra, which naturally was abbreviated 'lb'. We adopted the pound part from pondo, yet kept the abbreviation for libra. There are different definitions for the mass of a pound, depending on the country. In the United States, the modern pound unit is defined to be 2.20462234 pounds per metric kilogram. There are 16 ounces in 1 pound.