Number

A number is a mathematical object used in counting, measurement, and labelling.

Natural numbers

The original examples are the natural numbers 1, 2, 3, and so forth.

Numeral systems

A notational symbol that represents a number is called a numeral.

Other uses

In addition to their use in counting and measuring, numerals are often used for:

• Labels (as with telephone numbers)
• Ordering (as with serial numbers)
• Codes (as with ISBNs).

In common usage, the term number may refer to:

• A symbol
• A word, for example "two" -- see Numeral (linguistics)
• A mathematical abstraction

See also

General topics

• Abstraction (mathematics)
• Approximation
• Binary number
• Calculation
• Computing
• Counting
• Expression (mathematics)
• Glyph
• Hexadecimal
• Integer
• Irrational number
• Logarithm
• Mathematical constant
• Mathematical object
• Mathematics
• Measurement
• Natural logarithm
• Natural number
• Number sense
• Numbers station
• Numeral system
• Numerical analysis
• Numerical identification
• Operation (mathematics)
• Percentage
• Positional notation
• Quantity
• Ratio
• Rational number
• Real number
• Serial number
• Symbol
• The Magical Number Seven, Plus or Minus Two
• Unique identifier
• Value (mathematics)

Numbers

• 0
• 1
• 2
• 3

External links

• Number @ Wikipedia