What is billion? How to use in English

The word "billion" has a fascinating origin. It was first used in the late 14th century in Italy, where it was written as "bilione". This term referred to the value of arial coins, which were made from lightweight metals and were seemingly worthless. The word "bilione" was derived from the Italian phrase "mille milia", meaning "a thousand thousand" or "a million groups of a thousand". Over time, the spelling evolved into "billion", and the concept of a billion as a large, indefinite quantity of something took hold. By the 17th century, the billions were being used to describe large sums of money, distances, and even astronomical magnitudes. Today, the term is used universally to express a quantity of one thousand million.