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 pound symbol derives from the black letter L, which is an abbreviation of the word Librae in Roman. Libra was the basic Roman unit of weight, derived from the Latin word for scales or balance. From the beginning there was a connection between the weight of metal, usually silver, and the value of the currency.