How to Type the Diameter Symbol
Ways to type Ø and related technical symbols for measurements, drawings, and specs.
Click a symbol below to copy it instantly. A confirmation message will appear when it is on your clipboard.
Which diameter symbol should you use?
For many engineering notes, Ø is commonly used as a diameter sign. The dedicated diameter sign ⌀ also exists in Unicode, but it is not always supported by every font. If you are sharing documents widely, test the font before sending.
Copy-paste is often safest
Unlike copyright or degree symbols, diameter shortcuts vary by operating system and app. If you are writing a drawing note, spreadsheet, or product spec, copying Ø or ⌀ avoids layout surprises.
Use clear spacing
A readable format is Ø 25 mm or ⌀25 mm. Be consistent within the same document so readers do not wonder whether two styles mean different things.
Related symbol collections
If you want more options, browse our measurement symbols, math symbols. These pages are useful when you need to compare similar characters before copying one into a document.
Is Ø the same as zero?
No. Ø is a letter/symbol shape used in technical contexts; it should not be substituted with the number 0.
Use technical symbols with context
the symbol can be meaningful in technical drawings, specifications, schematics, or measurement notes, but the symbol alone is rarely enough. Add the value, unit, label, or drawing reference so another person can understand exactly what you mean.
Check the standard before publishing
Engineering and trade symbols can depend on industry standards. If the content will be used for manufacturing, inspection, or safety decisions, confirm the notation with the relevant standard or project documentation instead of relying on a casual visual match.
Quick FAQ
Can I copy and paste it? Yes. Copying the symbol is safe for normal documents, emails, web forms, and design tools. If it appears wrong after pasting, switch to a common font or copy it again from TypeSymbol.com.