Pound (lb)
The pound, symbol lb, is a unit of mass with origins in ancient Rome, where it was known as the libra. Standardized in England in the 14th century, the modern pound equals 0.453592 kilograms. Pounds remain in common use in the United States, Canada, and the UK for body weight, groceries, and various trades. The pound maintains continuity with traditional measurements while being used in parallel with metric units in international contexts. Its presence reflects the balance between imperial and metric systems.
Stone (st)
The stone (st) is a traditional British unit of mass, standardized as 14 pounds, which is roughly 6.35 kilograms. Its history dates back to medieval England, when stones of different weights were used as standards in trading. While most countries now use kilograms for official measurements, the stone is still frequently used in the UK and Ireland, especially to state a person’s body weight. Its ongoing use highlights both cultural tradition and the continued relevance of non-metric measures in everyday life.