∄
Symbol  Format  Data 

∄  Code Point 
U+2204 
TeX 
\nexists 

SVG 
The “there does not exist” symbol looks like the there exists symbol with a line struck through the symbol.
The "there exists" symbol (∃) is used in math, especially in logic and set theory, to denote the existence of an element in a particular set.
The ∀ (for all) symbol is used in math to describe the meaning of a variable in an expression.
The negation symbol is used in math to represent the logical negation operator.