# Diameter sign

Mathematical signs
arithmetic
Plus sign +
Minus sign - , ./.
Mark , ×
Divided sign : , ÷ , /
Plus minus sign ± ,
Comparison sign < , , = , , >
Root sign
Percent sign %
Analysis
Sum symbol Σ
Product mark Π
Difference sign , Nabla ,
Prime
Partial differential
Integral sign
Concatenation characters
Infinity symbol
geometry
Angle sign , , ,
Vertical , parallel ,
Triangle , square ,
Diameter sign
Set theory
Union , cut ,
Difference , complement ,
Element character
Subset , superset , , ,
Empty set
logic
Universal quantifier
Existential quantifier
Conjunction , disjunction ,
Negation sign ¬

The diameter symbol or average symbol ⌀ is a symbol used in planar geometry and engineering to denote diameters , and in arithmetic and statistics to denote arithmetic means .

## use

### diameter

The diameter symbol ⌀ is often used in technically oriented texts and technical drawings and is then placed in front of the numerical value of the diameter , in technical drawings without spaces between the symbol and the dimension. For example, “⌀10” denotes a diameter of 10 units of length of a circular , spherical, or cylindrical object.

In text works, according to DIN 5008, the diameter symbol may appear before or after the dimension, with a protected space between the dimension and the diameter symbol . Examples are:

• A pipe with 27 cm ⌀.
• A 15-inch pipe.

### Average

As the mean symbol, ⌀ denotes the arithmetic mean of a set of numbers . For example, in the table header or in the front column of game statistics, “⌀ goals” indicates the average number of goals (per game) by a team.

## Representation in computer systems

In addition to the diameter symbol, the following table lists various similar symbols with which the diameter symbol should not be confused.

DIN 5008 allows the Scandinavian capital letter Ø to be used instead of the diameter symbol in text works .

Diameter signs and similar signs
character Unicode
code point links to the Unicode block
Name / description Decimal
code
HTML
entity
Latex Keyboard entry
with assignment E1
U + 2300 diameter sign Diameter sign 8960 `\diameter` - 7
U + 2205 empty set Empty crowd sign 8709 ? `\varnothing` - =
O U + 00D8 latin capital letter o with stroke Scandinavian capital letter Ø 0216 & Oslash; `\O` - O
O U + 00F8 latin small letter o with stroke Scandinavian Small Letter ø 0248 & oslash; `\o` - o
U + 2298 circled division slash Circled divided line 8856 & osol; (HTML5) `\oslash`
(HTML5)This entity is only generally defined as of HTML5 .