Zero, including: Empty Set, Null Set, 0 (number), Zero-based Numbering, Zero Divisor, Derivative Of A Constant, Division By Zero, Empty Sum, ... Morphism, Zero-dimensional Space, /dev/zero

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More info: Zero, written 0, is both a number and the numerical digit used to represent that number in numerals. It plays 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. In the English language, 0 may be called zero, nought or (US) naught (both ), nil, or "o". Informal or slang terms for zero include zilch and zip. Ought or aught (both ), have also been used.