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0 (zero) is a number representing an empty quantity. In place-value notation such as the Hindu–Arabic numeral system, 0 also serves as a placeholder numerical digit, which works by multiplying digits to the left of 0 by the radix, usually by 10. As a number, 0 fulfills a central role in mathematics as the additive identity of the integers, real numbers, and other algebraic structures.
|Cardinal||0, zero, "oh" (//), nought, naught, nil|
|Ordinal||Zeroth, noughth, 0th|
|Arabic, Kurdish, Persian, Sindhi, Urdu||٠|
Common names for the number 0 in English are zero, nought, naught (//), nil. In contexts where at least one adjacent digit distinguishes it from the letter O, the number is sometimes pronounced as oh or o (//). Informal or slang terms for 0 include zilch and zip. Historically, ought, aught (//), and cipher, have also been used.