numbers

(noun): An abstract entity used to describe quantity.
(noun): A numeral: a symbol for a non-negative integer.
(noun): An element of one of several sets: natural numbers, integers, rational numbers, real numbers, complex numbers, and sometimes extensions such as hypercomplex numbers, etc.
(noun): (Followed by a numeral; used attributively) Indicating the position of something in a list or sequence. Abbreviations: No or No., no or no. (in each case, sometimes written with a superscript "o", like Nº or №). The symbol "#" is also used in this manner.
(noun): Quantity.
(noun): A sequence of digits and letters used to register people, automobiles, and various other items.
(noun): A telephone number.
(noun): (grammar) Of a word or phrase, the state of being singular, dual or plural, shown by inflection.
(noun): (in the plural) Poetic metres; verses, rhymes.
(noun): A performance; especially, a single song or song and dance routine within a larger show.
(noun): A person.
(noun): An item of clothing, particularly a stylish one.
(noun): A marijuana cigarette, or joint; also, a quantity of marijuana bought form a dealer.
(noun): An issue of a periodical publication.
(noun): A large amount, in contrast to a smaller amount; numerical preponderance.
(verb): To label (items) with numbers; to assign numbers to (items).
(verb): To total or count; to amount to.
(noun): Many individuals as a group.

Zero, one, −1, 2.5, and pi are all numbers.
The number 8 is usually made with a single stroke.
The equation e^{i\pi}+1=0 includes the most important numbers: 1, 0, \pi, i, and e.
Horse number 5 won the race.
Any number of people can be reading from a given repository at a time.