Statistics for 35 Math Symbols You Don't Know

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Hint	Answer	% Correct
∨	Disjunction, "or"	83%
R	Real Numbers	83%
C	Complex Numbers	72%
∧	Conjunction, "and"	72%
Δ	Delta	72%
∫	Integral / antiderivative	72%
∇	Nabla / Del	72%
N	Natural Numbers	72%
Q	Rational Numbers	72%
≡	Congruent, identically equal	67%
Z	Integers	67%
¬	Negation, "not"	67%
∑	Summation	67%
∪	Union	56%
∩	Intersection	50%
→, ⇒	Material conditional, "implies"	50%
∀	Universal Quantification, "for all"	50%
⊂	Set / Proper Subset	44%
⊆	Subset	39%
∏	Product	33%
⇔	Logical Equivalent, "if and only if"	28%
↔	Biconditional	22%
∉	"is not an element of"	22%
∂	Partial derivative, Boundary of a topological subspace	22%
H	Quaternions	22%
∈	Set Membership, "is an element of"	22%
∮	Contour Integral	17%
⊕, ⊻	Exclusive disjunction, "xor"	17%
∬, ∯	Surface Integral	17%
⊤	Down Tack / Verum	6%
∃	Existential Quantification, "There exists ... such that"	6%
⊥	Up Tack / Falsum	6%
⊔	Disjoint Union	0%
⊖	Symmetric difference	0%
∃!	Uniqueness Quantification, "There exists exactly one ... such that"	0%