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SYMBOL	HTML Entity(case sensitive)	MEANING
√	√	SQUARE ROOT
∝	∝	PROPORTIONAL TO
∞	∞	INFINITY
∠	∠	ANGLE
∧	∧	LOGICAL AND
∨	∨	LOGICAL OR
∩	∩	INTERSECTION
∪	∪	UNION
∴	∴	THEREFORE
∼	∼	TILDE OPERATOR
≅	≅	APPROXIMATELY EQUAL TO
≈	≈	ALMOST EQUAL TO
≠	≠	NOT EQUAL TO
≡	≡	IDENTICAL TO
≤	≤	LESS-THAN OR EQUAL TO
≥	≥	GREATER-THAN OR EQUAL TO
⊂	⊂	SUBSET OF
⊃	⊃	SUPERSET OF
⊄	⊄	NOT A SUBSET OF
⊆	⊆	SUBSET OF OR EQUAL TO
⊇	⊇	SUPERSET OF OR EQUAL TO
⊕	⊕	CIRCLED PLUS
⊗	⊗	CIRCLED TIMES
⊥	⊥	UP TACK
∀	∀	FOR ALL
∂	∂	PARTIAL DIFFERENTIAL
∃	∃	THERE EXISTS
∅	∅	EMPTY SET
∈	∈	ELEMENT OF
∉	∉	NOT AN ELEMENT OF
∋	∋	CONTAINS AS MEMBER
∏	∏	N-ARY PRODUCT
∑	∑	N-ARY SUMMATION
−	−	MINUS SIGN
∇	∇	NABLA
∫	∫	INTEGRAL