Copy & encode
Character
∅Unicode codepoint
U+2205HTML decimal entity
∅HTML hex entity
∅CSS escape
\2205JavaScript escape
\u2205Meaning and usage
It is commonly used in mathematical proofs, set theory notation, and computer science logic to denote an absence of values. Writers and academic publishers use it to represent null or void datasets.
Frequently Asked Questions
Is the empty set symbol the same as the Scandinavian letter Ø?
No, the empty set symbol is a distinct mathematical character, although they look very similar. You should use the correct Unicode character U+2205 for academic mathematical contexts.
How can I type the empty set symbol in HTML?
You can use the HTML entity name ∅ or the decimal code ∅ to display it on a web page.