⦲
⦲ EMPTY SET WITH SMALL CIRCLE ABOVE
| Codepoint | U+29B2 | 
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| Block | Miscellaneous Mathematical Symbols-B | 
| Sub-Block | Empty sets | 
| Category | Sm / Symbol, math | 
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| How to type "⦲" in Windows? | hold alt type + type 29B2 release alt  | 
    
| How to type "⦲" in Linux? | hold ctrl+shift type U 29B2 release ctrl+shift  |