The word thousand is a noun and defined as a number equal to 10 times 100. First used before the 12th century, the word thousand derives from the Old English word thūsend, which is related to the German word Tausend.
The original Roman numeral for thousand is “M”. The Hindu–Arabic numeral system was invented by Indian mathematicians between the 1st and 4th century. As the system spread through Eurasia, it was adopted by Arabic mathematicians around the 9th century AD. It wasn’t until the Middle ages when the famous Italian mathematician Fibonacci popularized the Hindu-Arabic numeral system in Europe with his book Liber Abaci (Book of Calculation). In most English speaking countries the symbol for thousand includes a comma between the one and zeros “1,000.”
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