### Algebra symbols

Symbol | Symbol Name |
---|---|

x |
x variable |

≡ | equivalence |

≜ | equal by definition |

:= | equal by definition |

~ | approximately equal |

≈ | approximately equal |

∝ | proportional to |

∞ | lemniscate |

≪ | much less than |

≫ | much greater than |

( ) | parentheses |

[ ] | brackets |

{ } | braces |

⌊x⌋ |
floor brackets |

⌈x⌉ |
ceiling brackets |

x! |
exclamation mark |

| x | |
single vertical bar |

f (x) |
function of x |

(f ∘ g) |
function composition |

(a,b) |
open interval |

[a,b] |
closed interval |

∆ | delta |

∆ | discriminant |

∑ | sigma |

∑∑ | sigma |

∏ | capital pi |

e |
e constant/ Euler’s number |

γ | Euler-Mascheroni constant |

φ | golden ratio |

π | pi constant |