The symbol or variable for diameter, ⌀, is sometimes used in technical drawings or specifications as a prefix or suffix for a number (e.g. "⌀ 55 mm"), indicating that it represents diameter. For example, photographic filter thread sizes are often denoted in this way.

The diameter sign (⌀) is a symbol used to represent the diameter of a circle, sphere or cylindrical object. The symbol ⌀ is also known as the “Diameter symbol” or “Diameter sign.” The diameter sign (⌀) is commonly used in technical drawings, engineering diagrams, blueprints, and other fields where the measurement of diameters is important.

The diameter symbol, also known as the diameter sign, (⌀) is predominantly used in technical texts. On both Mac and Windows, you can type the symbol for diameter or use the shortcut menu to insert the sign.

The diameter symbol, represented by the character Ø, is commonly used in mathematics, engineering, and science to indicate the diameter of a circle or the width of a cylindrical object. It is also used to represent the empty set in set theory and mathematical logic. This symbol may also mean different things in areas other than mathematics.

The diameter symbol