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  
Follow arrow  ⇒ , ⇔ , ⇐ 
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 15inch 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 .
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

Web links
Individual evidence
 ↑ DIN 40611: 199212 technical drawings; Dimensioning drawings; Basics of application (withdrawn standard, replaced by DIN EN ISO 1291: 202002 Technical Product Documentation (TPD)  Specification of dimensions and tolerances  Part 1: Basics , see: DIN 40611: 199212. Beuth Verlag , retrieved on March 4, 2020 . )
 ↑ DIN 5008 : 202003 Writing and design rules for text and information processing , Section 12.4 Characters for diameter
 ↑ DIN 5008: 202003, Appendix H.1 Table of punctuation marks and special characters
 ↑ W3C ( World Wide Web Consortium ): Character entity references in HTML 4
 ↑ Scott Pakin: The Comprehensive LaTeX Symbol List. (PDF, 8.7 MB) January 19, 2017, archived from the original on September 28, 2017 ; Retrieved on September 28, 2017 (English, linking the original results in a mirror of CTAN , the archive link compare file: Comprehensive LaTeX Symbol list.pdf ).
 ^ W3C ( World Wide Web Consortium ): Character entity reference chart