Mathematics | ||
---|---|---|

Alt Code | Symbol | Description |

Alt 48 - 57 | 0 - 9 | zero to nine |

Alt Codes for Basic Operators | ||

Alt Code | Symbol | Description |

Alt 43 | + | Plus Sign |

Alt 45 | - | Minus Sign |

Alt 0215 | × | Multiplication Sign |

Alt 0247 | ÷ | Obelus / Division sign |

Alt Codes for Percents | ||

Alt Code | Symbol | Description |

Alt 37 | % | Percentage Sign |

Alt 0137 | ‰ | Per mille (per thousand) |

Alt Codes for Bracketing | ||

Alt Code | Symbol | Description |

Alt 40 | ( | Open Bracket |

Alt 41 | ) | Close Bracked |

Alt Codes for Degree of Accuracy | ||

Alt Code | Symbol | Description |

Alt 241 | ± | Plus or Minus |

Alt Codes for Fractions | ||

Alt Code | Symbol | Description |

Alt 47 | / | Fraction seperator |

Alt 0188 | ¼ | Quarter |

Alt 0189 | ½ | Half |

Alt 0190 | ¾ | Three quarters |

Alt 46 | . | Decimal Point |

Alt Codes for Equality | ||

Alt Code | Symbol | Description |

Alt 240 | ≡ | Exactly Identical |

Alt 61 | = | Equals |

Alt 247 | ≈ | Approximately equal |

Alt Codes for Inequality | ||

Alt Code | Symbol | Description |

Alt 60 | < | Less Than |

Alt 62 | > | Greater Than |

Alt 242 | ≥ | Greater than or equal |

Alt 243 | ≤ | Less than or equal |

Alt Codes for Powers | ||

Alt Code | Symbol | Description |

Alt 251 | √ | Square Root |

Alt 252 | ⁿ | Power n |

Alt 0185 | ¹ | To the power of 1 |

Alt 0178 | ² | squared |

Alt 0179 | ³ | cubed |

Alt Codes for Trigonometry | ||

Alt Code | Symbol | Description |

Alt 227 | π | Pi |

Alt 248 | ° | Degree sign |

Alt Codes for General Mathematical Symbols | ||

Alt Code | Symbol | Description |

Alt 35 | # | Number |

Alt 236 | ∞ | Infinity |

Alt 230 | µ | Micro |

Alt 228 | Σ | Sum |

Alt 239 | ∩ | Intersection |

Alt Codes for Integration / Antiderivatives | ||

Alt Code | Symbol | Description |

Alt 244 | ⌠ | Top half |

Alt 245 | ⌡ | Bottom Half |

International Business Machines (IBM) developed a method to place characters that were previously impossible to type with a traditional QWERTY keyboard on the screen. By holding down the ALT key, developers and end users could define the intended character by way of the numeric keypad. The computer system's Basic Internal Operating System (BIOS) subsequently interprets the action and placing the correct corresponding symbol at the location of the cursor.

Such codes became so incredibly popular that although Microsoft decided upon developing additional sets of codes, they also decided to keep the existing Alt codes. The new set designed to coexist with also codes was originally named ANSI, with the old version redesignated as Original Equipment Manufacturer (OEM). Codes written in OEM are represented in 3 digits while codes written in ANSI codes begin with a preceding 0.

For the past 20 years, Unicode has seen major adoption by a growing number of systems. The entry of all Unicode characters by the same method of Windows was achieved by many applications yet still couldn't spread to every system. Issues of compatibility with old ANSI codes prevented the entry of every single character.

- Depending on the setting of the OEM Code Page, different characters may be produced with the same code.
- It is critical to have the system's NUM LOCK enabled when typing a character's alt code value.
- Though it is present on some models, the right-most numeric keypad does NOT exist
on most laptops. To still make sufficient use of the functionality, most laptop users are required
to use press and hold down the
**Fn**key.

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