# 0

## Number / From Wikipedia, the free encyclopedia

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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.

**Quick facts: ← −1 0 1 → , Cardinal, Ordinal, Binary, Te...**▼

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Cardinal | 0, zero, "oh" (/oʊ/), nought, naught, nil | |||

Ordinal | Zeroth, noughth, 0th | |||

Binary | 0_{2} | |||

Ternary | 0_{3} | |||

Senary | 0_{6} | |||

Octal | 0_{8} | |||

Duodecimal | 0_{12} | |||

Hexadecimal | 0_{16} | |||

Arabic, Kurdish, Persian, Sindhi, Urdu | ٠ | |||

Hindu Numerals | ० | |||

Chinese | 零, 〇 | |||

Khmer | ០ | |||

Thai | ๐ | |||

Bangla | ০ |

Common names for the number 0 in English are *zero*, *nought*, *naught* (/nɔːt/), *nil*. In contexts where at least one adjacent digit distinguishes it from the letter O, the number is sometimes pronounced as *oh* or *o* (/oʊ/). Informal or slang terms for 0 include *zilch* and *zip*. Historically, *ought*, *aught* (/ɔːt/), and *cipher*, have also been used.