# Numeral system

## notation for expressing numbers / From Wikipedia, the free encyclopedia

A **numeral system** (also called a **number system** or **system of numeration**) is a way to write numbers. Roman numerals and tally marks are examples. "11" usually means eleven, but if the numeral system is binary, then "11" means three.

**Quick Facts**by culture, Hindu–Arabic numerals ...

Numeral systems by culture | |
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Hindu–Arabic numerals | |

Western Arabic Eastern Arabic Khmer |
Indian family Brahmi Thai |

East Asian numerals | |

Chinese Suzhou Counting rods |
Japanese Korean |

Alphabetic numerals | |

Abjad Armenian Cyrillic Ge'ez |
Hebrew Greek (Ionian) Āryabhaṭa |

Other systems | |

Attic Babylonian Egyptian Etruscan |
Mayan Roman Urnfield |

List of numeral system topics | |

Positional systems by base | |

Decimal (10) | |

2, 4, 8, 16, 32, 64 | |

1, 3, 9, 12, 20, 24, 30, 36, 60, more… | |

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A numeral is a way to represent a number. It may be a symbol or a word in a natural language, or a group of them. Numerals differ from numbers just as the word "rock" differs from a real rock. The symbols "11", "eleven" and "XI" are all numerals that represent the same number. Babylonian numerals, Greek numerals and Roman numerals are among the systems that were long used, before the Hindu–Arabic numeral system largely replaced them.