# Division sign

(Redirected from ÷)
÷
Division sign
In UnicodeU+00F7 ÷ DIVISION SIGN (&divide;, &div;)
Different from
Different fromU+2052 COMMERCIAL MINUS SIGN
U+002B + PLUS SIGN
U+2020 DAGGER
U+034B ͋ COMBINING HOMOTHETIC ABOVE
Related

The division sign (÷) is a mathematical symbol consisting of a short horizontal line with a dot above and another dot below, used in Anglophone countries to indicate the operation of division. This usage, though widespread in some countries, is not universal and the symbol has a different meaning in other countries. Its use to denote division is not recommended in the ISO 80000-2 standard for mathematical notation.[1]

## In mathematics

The obelus, a historical glyph consisting of a horizontal line with (or without) one or more dots, was first used as a symbol for division in 1659, in the algebra book Teutsche Algebra by Johann Rahn, although previous writers had used the same symbol for subtraction.[2] Some near-contemporaries believed that John Pell, who edited the book, may have been responsible for this use of the symbol.[2] Other symbols for division include the slash or solidus /, the colon :, and the fraction bar (the horizontal bar in a vertical fraction).[3][4] The ISO 80000-2 standard for mathematical notation recommends only the solidus / or "fraction bar" for division, or the "colon" : for ratios; it says that the ÷ sign "should not be used" for division.[1]

In Italy, Poland and Russia, the ÷ sign was sometimes used to denote a range of values, and in Scandinavian countries it was used as a negation sign.[5]

The same symbol has been used to represent subtraction in north-eastern Europe: the Unicode Consortium has allocated a separate code point, U+2052 COMMERCIAL MINUS SIGN for this usage uniquely;[6][7] the exact form of the symbol displayed is typeface (font) dependent.

## In computer systems

### Encoding

The symbol was assigned to code point 0xF7 in ISO 8859-1, as the "division sign". This encoding was transferred to Unicode as U+00F7.[8] In HTML, it can be encoded as `&divide;` or `&#xF7;` (at HTML level 3.2), or as `&#247;`.

Unicode provides various division symbols:[9]

Code Point Name Symbol
U+00F7 Division Sign ÷
U+27CC Long Division
U+2215 Division Slash
U+2A38 Circled Division Sign
U+2797 Heavy Division Sign
U+2298 Circled Division Slash
U+22C7 Division Times
U+29BC Circled Anticlockwise-Rotated

### Keyboard entry

In Microsoft Windows, this division sign is produced with Alt+0247 (or 246 with no zero) on the number pad, or by pressing Alt Gr+⇧ Shift++ when an appropriate keyboard layout is in use. In classic Mac OS and macOS, it is produced with ⌥ Option+/.

On UNIX-based systems using Screen or X with a Compose key enabled, it can be produced by composing : (colon) and - (hyphen/minus). It may also be produced using its Unicode code-point (F7), by pressing Control+⇧ Shift+u f7space.

In LaTeX, the division sign is obtained by the command `\div`.

In ChromeOS (with International/Extended keyboard setting), the division sign is obtained by pressing AltGr+⇧ Shift++. Otherwise, the Unix-style methods may be used.