The ISO Latin 1 character repertoire – a description with usage notes, section 3 The characters grouped by type, with annotations:

% | percent sign |

+ | plus sign |

- | hyphen-minus |

± | plus-minus |

< | less-than sign |

> | greater-than sign |

= | equals sign |

¬ | not sign |

¯ | macron |

× | multiplication sign |

÷ | division sign |

° | degree sign |

µ | micro sign |

Notes:

- Asterisk is used as a multiplication symbol in several programming languages.
- Solidus (slash) is often used as a division symbol.
- The exclamation mark is, in addition to its primary use for punctuation, also used to denote a factorial (originally as a workaround, see notes on the factorial symbol in The History of Mathematical Symbols by Douglas Weaver.
- When presenting real numbers, the full stop is used (in English) as a decimal point (e.g. "1.5") whereas many other languages use comma (e.g. "1,5").

A Brief History of the Notation of Boole's Algebra by Michael Schroeder contains, in section Algebraic Notation, information on the history of some mathematical symbols.

Originally created 2000-03-31. Structurally changed 2018-10-16. Minor modifications 2018-12-15.

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