HTML and XHTML Pocket Reference, 3rd Edition

Mathematical Operators

Decimal	Entity	Symbol	Description
∀	∀	∀	For all
∂	∂	∂	Partial differential
∃	∃	∃	There exists
∅	∅	∅	Empty set, null set, diameter
∇	∇	∇	Nabla, backward difference
∈	∈	∈	Element of
&#8713	∉	∉	Not an element of
∋	∋	∋	Contains as a member
∏	∏	∏	N-ary product, product sign
∑	∑	∑	N-ary summation
−	−	-	Minus sign
∗	∗	*	Asterisk operator
√	√	√	Square root, radical sign
∝	∝	∝	Proportional
∞	∞	∞	Infinity symbol
∠	∠	∠	Angle
∧	∧	∧	Logical and, wedge
∨	∨	∨	Logical or, vee
∩	∩	∩	Intersection, cap
∪	∪	∪	Union, cup
∫	∫	∫	Integral
∴	∴	∴	Therefore
∼	∼	~	Tilde operator, varies with, similar to
≅	≅	≅	Approximately equal to
≈	≈	≈	Almost equal to, asymptotic to
≠	≠	≠	Not equal to
≡	≡	≡	Identical to
≤	≤	≤	Less than or equal to
≥	≥	≥	Greater than or equal to
⊂	⊂	⊂	Subset of
⊃	⊃	⊃	Superset of
⊄	⊄	⊄	Not a subset of
⊆	&sube	⊆	Subset of or equal to
⊇	&supe	⊇	Superset of or equal to
⊕	⊕	⊕	Circled plus, direct sum
⊗	⊗	⊗	Circled times, vector product
⊥	⊥	⊥	Up tack, orthogonal to, perpendicular
⋅	⋅	⋅	Dot operator