a quantity expressed in two different units | compound number; |

the number designating place in an ordered sequence | no.; ordinal; ordinal number; |

the first element in a countable series | first; number 1; number one; |

the number of elements in a mathematical set; denotes a quantity but not the order | cardinal; cardinal number; |

(numeration system) the positive integer that is equivalent to one in the next higher counting place | base; radix; |

a number represented in floating-point notation | floating-point number; |

a number represented in fixed-point notation | fixed-point number; |

the number of observations in a given statistical category | absolute frequency; frequency; |

a cardinal number represented as 1 followed by 100 zeros (ten raised to the power of a hundred) | googol; |

a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol) | googolplex; |

the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element | atomic number; |

the atomic number of an extra stable strongly bound atomic nucleus: 2, 8, 20, 28, 50, 82 or 126 | magic number; |

a number equal to the difference between the number of baryons and the number of antibaryons in any subatomic structure; it is conserved in all types of particle interactions | baryon number; |

a prescribed number | quota; |

a measure of length | long measure; |

the extent or degree to which something is magnetized | magnetisation; magnetization; |

a measure of the strength of a magnetic field over a given area | magnetic flux; |

a unit for measuring absorption | absorption unit; |

a unit for measuring acceleration | acceleration unit; |

a unit of measurement for angles | angular unit; |