36 relations: Atomic number, Binary number, British English, Chemical compound, Chlorine, Cricket, David Shepherd (umpire), Decimal, Eight queens puzzle, Emergency telephone number, Harshad number, Horatio Nelson, 1st Viscount Nelson, Hydrocarbon, J. R. R. Tolkien, List of highways numbered 111, List of numeral systems, Magic constant, Magic square, New Zealand, NHS 111, Nonagonal number, Number, Palindromic number, Perfect totient number, Prime number, Repunit, Roentgenium, Solvent, The Fellowship of the Ring, The Penguin Dictionary of Curious and Interesting Numbers, 1,1,1-Trichloroethane, 110 (number), 111 (emergency telephone number), 112 (number), 222 (number), 666 (number).

## Atomic number

In chemistry and physics, the atomic number of a chemical element (also known as its proton number) is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus.

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## Binary number

In mathematics and digital electronics, a binary number is a number expressed in the binary numeral system, or base-2 numeral system, which represents numeric values using two different symbols: typically 0 (zero) and 1 (one).

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## British English

British English is the English language as spoken and written in Great Britain or, more broadly, throughout the British Isles.

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## Chemical compound

A chemical compound (or just compound if used in the context of chemistry) is an entity consisting of two or more different atoms which associate via chemical bonds.

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## Chlorine

Chlorine is a chemical element with symbol Cl and atomic number 17.

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## Cricket

Cricket is a bat-and-ball game played between two teams of 11 players each on a field at the centre of which is a rectangular 22-yard-long pitch.

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## David Shepherd (umpire)

David Robert Shepherd MBE (27 December 1940 – 27 October 2009) was a first-class cricketer who played county cricket for Gloucestershire, and later became one of the cricket world's best-known umpires.

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## Decimal

The decimal numeral system (also called base 10 or occasionally denary) has ten as its base.

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## Eight queens puzzle

The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard so that no two queens threaten each other.

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## Emergency telephone number

In many countries the public telephone network has a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assistance.

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## Harshad number

In recreational mathematics, a Harshad number (or Niven number) in a given number base, is an integer that is divisible by the sum of its digits when written in that base.

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## Horatio Nelson, 1st Viscount Nelson

Horatio Nelson, 1st Viscount Nelson, KB (29 September 1758 – 21 October 1805) was a British flag officer in the Royal Navy.

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## Hydrocarbon

In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.

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## J. R. R. Tolkien

John Ronald Reuel Tolkien (Tolkien pronounced his surname, see his phonetic transcription published on the illustration in The Return of the Shadow: The History of The Lord of the Rings, Part One. Christopher Tolkien. London: Unwin Hyman, 1988. (The History of Middle-earth; 6) ISBN 0-04-440162-0. In General American the surname is also pronounced. This pronunciation no doubt arose by analogy with such words as toll and polka, or because General American speakers realise as, while often hearing British as; thus or General American become the closest possible approximation to the Received Pronunciation for many American speakers. Wells, John. 1990. Longman pronunciation dictionary. Harlow: Longman, ISBN 0-582-05383-8 3 January 18922 September 1973) was an English writer, poet, philologist, and university professor who is best known as the author of the classic high-fantasy works The Hobbit, The Lord of the Rings, and The Silmarillion.

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## List of highways numbered 111

The following roads are numbered 111.

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## List of numeral systems

This is a list of numeral systems, that is, writing systems for expressing numbers.

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## Magic constant

The magic constant or magic sum of a magic square is the sum of numbers in any row, column, or diagonal of the magic square.

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## Magic square

In recreational mathematics, a magic square is an arrangement of distinct numbers (i.e. each number is used once), usually integers, in a square grid, where the numbers in each row, and in each column, and the numbers in the main and secondary diagonals, all add up to the same number.

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## New Zealand

New Zealand (Aotearoa) is an island country in the southwestern Pacific Ocean.

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## NHS 111

NHS 111 is a free-to-call single non-emergency number medical helpline operating in England and Scotland.

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## Nonagonal number

A nonagonal number is a figurate number that extends the concept of triangular and square numbers to the nonagon (a nine-sided polygon).

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## Number

A number is a mathematical object used to count, measure and label.

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## Palindromic number

A palindromic number or numeral palindrome is a number that remains the same when its digits are reversed.

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## Perfect totient number

In number theory, a perfect totient number is an integer that is equal to the sum of its iterated totients.

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## Prime number

A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.

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## Repunit

In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1 — a more specific type of repdigit.

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## Roentgenium

Roentgenium is a chemical element with symbol Rg and atomic number 111.

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## Solvent

A solvent (from the Latin solvō, "I loosen, untie, I solve") is a substance that dissolves a solute (a chemically different liquid, solid or gas), resulting in a solution.

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## The Fellowship of the Ring

The Fellowship of the Ring is the first of three volumes of the epic novel The Lord of the Rings by the English author J. R. R. Tolkien.

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## The Penguin Dictionary of Curious and Interesting Numbers

The Penguin Dictionary of Curious and Interesting Numbers is a reference book for recreational mathematics and elementary number theory written by David Wells.

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## 1,1,1-Trichloroethane

The organic compound 1,1,1-trichloroethane, also known as methyl chloroform, is a chloroalkane.

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## 110 (number)

110 (one hundred ten) is the natural number following 109 and preceding 111.

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## 111 (emergency telephone number)

111 (usually pronounced one-one-one) is the emergency telephone number in New Zealand.

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## 112 (number)

112 (one hundred twelve) is the natural number following 111 and preceding 113.

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## 222 (number)

222 (two hundred twenty-two) is the natural number following 221 and preceding 223.

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## 666 (number)

666 (six hundred sixty-six) is the natural number following 665 and preceding 667.

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