数学符号表－英文读法，含义，用法

Symbol	What it is	How it is read	How it is used
	Addition sign Logical OR symbol	... plus ... ... or ...	Sum of a few values Logical disjunction
	Multiplication sign Logical AND symbol	... times ... ... and ...	Product of two values Logical conjunction
	Multiplication sign	... times ...	Product of two values
	Summation sign	The summation of ...	Sum of many or infinitely many values
	Integral sign	The integral of ...	Integration
	Subtraction sign Minus sign	... minus ... Negative...	Difference of two values, negative number
	Plus/minus sign	... plus or minus ...	Expression of range, error, or tolerance
	Dot product sign	... dot ...	Scalar (dot) product of two vectors
	Cross product sign	... cross ...	Vector (cross) product of two vectors
	Product sign	The product of ...	Product of three up to infinitely many values
	Carat	... to the power of ...	Exponent
	Exclamation	... factorial	Product of all positive integers up to a certain value
	Continuation sign	... and so on up to ... ... and so on indefinitely	Extension of sequence
	Slash	... divided by ... ... over ...	Division
	Division sign	... divided by ...	Division
	Percent symbol	... percent ...	Proportion
	Per mil symbol	... per mil ...	Proportion
	Colon Ratio sign	... is to ... ... such that ... ... it is true that ...	Division or ratio, symbol following logical quantifier or used in defining a set
	Vertical line	... such that ... ...it is true that ...	Symbol following logical quantifier or used in defining a set
	Double colon	... averaged with ...	Arithmetic mean
	Lemniscate	... infinity ... increases without limit	Infinite summations Infinite sequence Limit
	Parentheses	... quantity ... ... list ... ...set of coordinates... ...open interval	Denotes a quantity, list, set of coordinates, or an open interval
	Square brackets	... the quantity ... ... the closed interval ...	Denotes a quantity or a closed interval
	Hybrid brackets	... the half-open interval ...	Denotes a half-open interval
	Hybrid brackets	... the half-open interval ...	Denotes a half-open interval
	Curly brackets	... the quantity ... ... the set ...	Denotes a quantity or a set
	Equal sign	... equals ...	Indicates two values are the same
	Proportionality sign	... is proportional to ...	Indicates two variables change in direct proportion

	Parentheses	... quantity ... ... list ... ...set of coordinates... ...open interval	Denotes a quantity, list, set of coordinates, or an open interval
	Square brackets	... the quantity ... ... the closed interval ...	Denotes a quantity or a closed interval
	Hybrid brackets	... the half-open interval ...	Denotes a half-open interval
	Hybrid brackets	... the half-open interval ...	Denotes a half-open interval
	Curly brackets	... the quantity ... ... the set ...	Denotes a quantity or a set
	Equal sign	... equals ...	Indicates two values are the same
	Proportionality sign	... is proportional to ...	Indicates two variables change in direct proportion
	Similarity sign	... is similar to ...	Indicates two objects are geometrically similar
	Approximate equal sign	... is approximately equal to ...	Indicates two values are close to each other
	Inequality sign	... is not equal to ...	Indicates two values are different
	Inequality sign	... is less than ...	Indicates value on left is smaller than value on right
	Inequality sign	... is less than or equal to ... ... is at most equal to ...	Indicates value on left is smaller than or equal to value on right
	Inequality sign	... is greater than ... ... is at most equal to ...	Indicates value on left is larger than value on right
	Absolute value sign	The absolute value of ...	Distance of value from origin in number line, plane, or space
	Inequality sign	... is greater than or equal to ...	Indicates value on left is larger than or equal to value on right
	Increment sign Triangle symbol	The change in ... Triangle ...	Indicates a small change, Denotes vertices of triangle
	Existential quantifier	For some ... There exists a(n) ...	Logical statements
	Universal quantifier	For all ... For every ...	Logical statements
	Logical negation symbol	not ...	Logical statements
	Logical implication symbol	... implies ... If ... then ...	Logical statements
	Logical equivalence symbol	... is logically equivalent to ... ... if and only if ..	Logical statements
	Three dots	... therefore ... ... it follows that ...	Logical statements or mathematical proofs
	Element-of symbol	... is an element of a set ...	Sets
	Not-element-of symbol	... is not an element of a set ...	Sets
	Subset symbol	... is a subset of ...	Sets
	Proper subset symbol	... is a proper subset of ...	Sets
	Union symbol	... union ...	Sets
	Intersection symbol	... intersect ... ... intersected with ...	Sets
	Null symbol	The null set The empty set	Sets
	Hebrew aleph (uppercase)	Aleph ...	Transfinite cardinal
	Degree symbol	... degree(s)	Angular measure Temperature
	Greek theta (lowercase)	... theta ...	Angular variable
	Greek phi (lowercase)	... phi ...	Angular variable
	Greek lambda (lowercase)	... lambda ...	Wavelength Ratio Eigenvalue Lebesgue measure
	Greek mu (lowercase)	micro- (10-6)	Prefix multiplier
	Greek pi (lowercase)	... pi ...	General science
	Greek omega (uppercase)	... omega ...	Volume of an object Ohms (resistance)
	Greek omega (lowercase)	... omega ...	Transfinite ordinal Angular velocity Period
	Enhanced or bold N	The set of natural numbers	Number theory Set theory
	Enhanced or bold Z	The set of integers	Number theory Set theory
	Enhanced or bold Q	The set of rational numbers	Number theory Set theory
	Enhanced or bold R	The set of real numbers	Number theory Set theory