HTML Entity - Empty Set / Diameter
Empty Set / Diameter is a mathematical operators, comparison symbols, and notation characters. This HTML entity enables web developers to display this character reliably across all browsers without encoding issues.
U+2205
∅
\2205
Use this HTML entity in mathematical expressions and equations. For example, ≠ for not equal, ≤ for less than or equal, ∞ for infinity.
Related Entities
Common Mistakes
Mistake: Using the letter O or digit 0 instead of ∅
Fix: Use ∅ (∅) for the empty set symbol. Writing O or 0 is ambiguous and not standard in set theory.
Mistake: Confusing ∅ (empty set) with ⌀ (diameter sign)
Fix: The empty set ∅ uses a diagonal stroke. The diameter sign ⌀ uses a horizontal stroke and is a different character entirely.
Empty Set / Diameter
Select any code to highlight it before copying.
| Unicode | U+2205 |
|---|---|
| Hex Code | ∅ |
| HTML Code | ∅ |
| HTML Entity | ∅ |
| CSS Code | \2205 |
| Windows Shortcut | |
| Mac Shortcut | |
