0 (zero) is a number, and the numerical digit used to represent that number in numerals. It fulfills a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures. As a digit, 0 is used as a placeholder in place value systems. Names for the number 0 in English include zero, nought (UK), naught (US; /nɔːt/), nil, or—in contexts where at least one adjacent digit distinguishes it from the letter "O"—oh or o (/oʊ/). Informal or slang terms for zero include zilch and zip. Ought and aught (/ɔːt/), as well as cipher, have also been used historically.
Depending on the context, there may be different words used for the number zero (or the concept of zero). For the simple notion of lacking, the words nothing and none are often used. Sometimes, the word nought or naught is used. Several sports have specific words for a score of zero, such as love in tennis and duck in cricket; nil is used for many sports in British English. It is often called oh in the context of telephone numbers. Slang words for zero include zip, zilch, nada, and scratch. Duck egg and goose egg are also slang for zero.
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