14 relations: ! (disambiguation), !!!, Alt key, Boolean data type, Double factorial, Double negation, Exclamation mark, General Punctuation (Unicode block), Haskell (programming language), Microsoft Windows, Numeric keypad, Retroflex clicks, 1 (number), 9 (number).

## ! (disambiguation)

! is a punctuation mark called an exclamation mark (33 in ASCII), exclamation point, ecphoneme, or bang.

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## !!!

!!! is a dance-punk band that formed in Sacramento, California, in 1996 by lead singer Nic Offer.

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## Alt key

or The Alt key (pronounced) on a computer keyboard is used to change (alternate) the function of other pressed keys.

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## Boolean data type

In computer science, the Boolean data type is a data type, having two values (usually denoted true and false), intended to represent the truth values of logic and Boolean algebra.

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## Double factorial

In mathematics, the product of all the integers from 1 up to some non-negative integer n that have the same parity as n is called the double factorial or semifactorial of n and is denoted by n!!.

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## Double negation

In propositional logic, double negation is the theorem that states that "If a statement is true, then it is not the case that the statement is not true." This is expressed by saying that a proposition A is logically equivalent to not (not-A), or by the formula A ≡ ~(~A) where the sign ≡ expresses logical equivalence and the sign ~ expresses negation.

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## Exclamation mark

The exclamation mark or exclamation point is a punctuation mark usually used after an interjection or exclamation to indicate strong feelings or high volume (shouting), and often marks the end of a sentence.

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## General Punctuation (Unicode block)

General Punctuation is a Unicode block containing punctuation, spacing, and formatting characters for use with all scripts and writing systems.

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## Haskell (programming language)

Haskell is a standardized, general-purpose purely functional programming language, with non-strict semantics and strong static typing.

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## Microsoft Windows

Microsoft Windows (or simply Windows) is a metafamily of graphical operating systems developed, marketed, and sold by Microsoft.

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## Numeric keypad

A numeric keypad, number pad, numpad, or ten key, is the palm-sized, 17-key section of a standard computer keyboard, usually on the far right.

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## Retroflex clicks

The retroflex clicks are a family of click consonants known only from the Central !Kung dialects of Namibia and the Damin ritual jargon of Australia.

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## 1 (number)

1 (one; or, also called "unit", "unity", and "(multiplicative) identity", 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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## 9 (number)

9 (nine) is the natural number following 8 and preceding 10.

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## Redirects here:

!! (disambiguation), ‼, ‼ (disambiguation).