There are several symbols that are adopted for common sets. They are given in the table below:
Table 1: Symbols denoting common sets
| Symbol | Corresponding Set |
| N | Represents the set of all Natural numbers i.e. all the positive integers.This can also be represented by Z+.Examples: 9, 13, 906, 607, etc. |
| Z | Represents the set of all integersThe symbol is derived from the German word Zahl, which means number.Positive and negative integers are denoted by Z+ and Z– respectively.Examples: -12, 0, 23045, etc. |
| Q | Represents the set of Rational numbersThe symbol is derived from the word Quotient. It is defined as the quotient of two integers (with non-zero denominator)Positive and negative rational numbers are denoted by Q+ and Q– respectively.Examples: 13/9. -6/7, 14/3, etc. |
| R | Represents the Real numbers i.e. all the numbers located on the number line.Positive and negative real numbers are denoted by R+ and R– respectively.Examples: 4.3, π, 4√ 3, etc. |
| C | Represents the set of Complex numbers.Examples: 4 + 3i, i, etc. |
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