What is diameter symbol?

Some articles on diameter symbol, symbol, diameter:

Diameter Symbol
... with the Scandinavian letter "Ø" or the Empty set symbol "∅" ... The symbol or variable for diameter, ⌀, is similar in size and design to ø, the Latin small letter o with stroke ... Unicode provides character number 8960 (hexadecimal 2300) for the symbol, which can be encoded in HTML webpages as #8960 or #x2300 ...

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