Dictionary

An abstract entity used to describe quantity.

Example: Zero, one, −1, 2.5, and pi are all numbers.

A numeral: a symbol for a non-negative integer.

Example: The number 8 is usually made with a single stroke.

An element of one of several sets: natural numbers, integers, rational numbers, real numbers, complex numbers, and sometimes extensions such as hypercomplex numbers, etc.

Example: The equation e^{i\pi}+1=0 includes the most important numbers: 1, 0, \pi, i, and e.

(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.

Example: Horse number 5 won the race.

A symbol that is not a word and represents a number, such as the Arabic numerals 1, 2, 3 and the Roman numerals I, V, X, L.

A word representing a number.

A card whose rank is a number (usually including the ace as 1).

Example: Jacks, queens, and kings are not numerals.