17 relations: Ø, Ø (disambiguation), Diameter, Empty set, Null, O, Phi, Sid Wilson, Slashed zero, Theta, Year Zero (disambiguation), Zero (disambiguation), Zero sharp, 0 (number), 0 (year), 00, 0°.

## Ø

Ø or (minuscule: ø) is a vowel and a letter used in the Danish, Norwegian, Faroese and Southern Sami languages and in the (now dead) language Old Swedish.

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## Ø (disambiguation)

The letter Ø and the similar-looking symbol ∅ may refer to.

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## Diameter

In geometry, the diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

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## Empty set

In mathematics, and more specifically set theory, the empty set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero.

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## Null

Null may refer to.

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## O

O (named o, plural oes) is the 15th letter and the second-to-last vowel in the modern English alphabet and the ISO basic Latin alphabet.

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## Phi

Phi (uppercase Φ, lowercase or; ϕεῖ, pheî,; modern φι, fi,; English) is the 21st letter of the Greek alphabet.

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## Sid Wilson

Sidney George Wilson (born January 20, 1977) also known as Ratboy or DJ Starscream, #0 (or 0), is an American disc jockey known as the turntablist of the Grammy Award winning band Slipknot.

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## Slashed zero

The slashed zero is a representation of the number '0' (zero), with a slash through it.

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## Theta

Theta (uppercase Θ or Ө, lowercase θ (which resembles digit 0 with horizontal line) or ϑ; θῆτα, thē̂ta,; Modern: θήτα|, thī́ta) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth.

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## Year Zero (disambiguation)

Year Zero is the year before 1 AD used in astronomical calculations.

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## Zero (disambiguation)

Zero is the name for both the digit 0 and the number 0.

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## Zero sharp

In the mathematical discipline of set theory, 0# (zero sharp, also 0#) is the set of true formulae about indiscernibles and order-indiscernibles in the Gödel constructible universe.

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## 0 (number)

0 (zero; BrE: or AmE) is both a number and the numerical digit used to represent that number in numerals.

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## 0 (year)

Year zero does not exist in the Anno Domini (or Common Era) system usually used to number years in the Gregorian calendar and in its predecessor, the Julian calendar.

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## 00

00, a double zero, may refer to.

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## 0°

0° or 0 degrees may refer to.

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