1 (one; /ˈwʌn/ or UK /ˈwɒn/) is a number, a numeral, and the name of the glyph representing that number. It represents a single entity, the unit of counting or measurement. For example, a line segment of "unit length" is a line segment of length 1.
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One, sometimes referred to as unity, is the integer before two and after zero. One is the first non-zero number in the natural numbers as well as the first odd number in the natural numbers.
Any number multiplied by one is the number, as one is the identity for multiplication. As a result, one is its own factorial, its own square, its own cube, and so on. One is also the empty product, as any number multiplied by one is itself, which produces the same result as multiplying by no numbers at all.
The glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Indians, who wrote 1 as a horizontal line, much like the Chinese character 一. The Gupta wrote it as a curved line, and the Nagari sometimes added a small circle on the left (rotated a quarter turn to the right, this 9-look-alike became the present day numeral 1 in the Gujarati and Punjabi scripts). The Nepali also rotated it to the right but kept the circle small.[1] This eventually became the top serif in the modern numeral, but the occasional short horizontal line at the bottom probably originates from similarity with the Roman numeral . In some European countries (e.g., Germany tConveyancing Houseloanmortgageloans Y House Loan Mortgage Loans Szh Xtr Gb Prog615 %E7%AD%91%E6%A2%A6%E8%AE%B0%E5%AE%9E House Loan Mortgage Loans 1 (number) - pedia, the free encyclopediar %A1%B6%CB%CE%C8%CA%D7%DA%C8%CC%B6%F6%A1%B7%B5%C4%B7%AD%D2%EB %D6%D0%B9%B2%B8%DF%B2%E3%C8%A8%B6%B7%C4%DA%C4%BB mConveyancing Houseloanmortgageloans Y House Loan Mortgage Loans Szh Xtr Gb Prog615 %E7%AD%91%E6%A2%A6%E8%AE%B0%E5%AE%9E House Loan Mortgage Loans 1 (number) - pedia, the free encyclopediaq h p p Fgtv20p %B4%AB%B1%B1%BE%A9%B7%A2%C9%FA%BE%FC%CA%C2%D5%FE%B1%E4+%B9%D9%C3%BD%B2%A2%CE%B4%CC%D8%B1%F0%D2%EC%B3%A3