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The numero sign or numero symbol, № (also represented as Nº, No̱, №, No., or no.), [1] [2] is a typographic abbreviation of the word number(s) indicating ordinal numeration, especially in names and titles. For example, using the numero sign, the written long-form of the address "Number 29 Acacia Road" is shortened to "№ 29 Acacia Rd ...
The symbol # is known variously in English-speaking regions as the number sign, [1] hash, [2] or pound sign. [3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔.
Numbers in mathematical formulae are never spelled out (3 < π < 22 / 7 not three < pi < twenty-two sevenths), and "numbers as numbers" are rarely spelled out in other mathematical contexts (the first three primes are 2, 3, and 5 not the first three primes are two, three, and five; but zero-sum game and roots of unity).
English number words include numerals and various words derived from them, ... originally from the abbreviation of kilo-, e.g. "He only makes $20K a year."
Ordinal indicator – Character(s) following an ordinal number (used when writing ordinal numbers, such as a super-script) Ordinal number – Generalization of "n-th" to infinite cases (the related, but more formal and abstract, usage in mathematics) Ordinal data, in statistics; Ordinal date – Date written as number of days since first day of ...
Furthermore, suffixes can be left out if the number obviously is an ordinal number, example: 3 utg. "3rd ed". Using a full stop as an ordinal indicator is considered archaic , but still occurs in military contexts; for example: 5. komp "5th company".
An even number is an integer that is "evenly divisible" by two, that is divisible by two without remainder; an odd number is an integer that is not even. (The old-fashioned term "evenly divisible" is now almost always shortened to "divisible".) Any odd number n may be constructed by the formula n = 2k + 1, for a suitable integer k.
Correct (proper name): produced by the British Broadcasting Corporation (BBC) Similarly, when showing the source of an acronym , initialism , or syllabic abbreviation , emphasizing the letters in the expansion that make up the acronym is unnecessary and potentially distracting: