三星安卓手机屏幕右上方出现“G、E、1X、3G、H、H+、T”符号表示什么意思？
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"非常感谢您花费时间完成这些问题。您的反馈意见对三星非常重要，有助于我们对网站进行改进"符号N表示什么?如G——重力
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扫描下载二维码Mathematical Symbols
List of all mathematical symbols and signs - meaning and examples.
Basic math symbols
SymbolSymbol NameMeaning / definitionExample
not equal sign
inequality
strict inequality
greater than
strict inequality
inequality
greater than or equal to
inequality
less than or equal to
parentheses
calculate expression inside first
2 & (3+5) = 16
calculate expression inside first
[(1+2)*(1+5)] = 18
subtraction
plus - minus
both plus and minus operations
3 & 5 = 8 and -2
minus - plus
both minus and plus operations
multiplication
multiplication
multiplication
division / fraction
remainder calculation
7 mod 2 = 1
decimal point, decimal separator
2.56 = 2+56/100
square root
&a&&&&a&&= a
forth root
n-th root (radical)
for&n=3,&n&8&= 2
1% = 1/100
10% & 30 = 3
1& = 1/1000 = 0.1%
10& & 30 = 0.3
1ppm = 1/1000000
10ppm & 30 = 0.0003
per-billion
10ppb & 30 = 3&10-7
per-trillion
1ppb = 10-12
10ppb & 30 = 3&10-10
Geometry symbols
SymbolSymbol NameMeaning / definitionExample
formed by two rays
measured angle
spherical angle
right angle
1 turn = 360&
line from point A to point B
line that start from point A
perpendicular
perpendicular lines (90angle)
parallel lines
congruent to
equivalence of geometric shapes and size
?ABC&&&?XYZ
similarity
same shapes, not same size
?ABC&~&?XYZ
triangle shape
&DABC&&&&DBCD
distance between points x and y
|&x-y&| = 5
pi constant
is the ratio between the circumference and diameter of a circle
c&=&&&d&= 2&&&r
radians angle unit
360&= 2& rad
grads angle unit
360&= 400 grad
Algebra symbols
SymbolSymbol NameMeaning / definitionExample
x variable
unknown value to find
when 2x&= 4, then&x&= 2
equivalence
identical to
equal by definition
equal by definition
equal by definition
equal by definition
approximately equal
weak approximation
approximately equal
approximation
sin(0.01) & 0.01
proportional to
proportional to
f(x)&&&g(x)
much less than
much less than
1&<<&1000000
much greater than
much greater than
1000000&>>&1
parentheses
calculate expression inside first
2 * (3+5) = 16
calculate expression inside first
[(1+2)*(1+5)] = 18
floor brackets
rounds number to lower integer
ceiling brackets
rounds number to upper integer
exclamation mark
4! = 1*2*3*4 = 24
single vertical bar
absolute value
| -5 | = 5
function of x
maps values of x to f(x)
f&(x) = 3x+5
function composition
(f&?g)&(x) =&f&(g(x))
f&(x)=3x,&g(x)=x-1&&rA(f&?g)(x)=3(x-1)&
open interval
(a,b)&?&{x&|&a&&&x&&&b}
closed interval
[a,b]&?&{x&|&a&&&x&&&b}
change / difference
?t&=&t1&-&t0
discriminant
&D =&b2&- 4ac
summation - sum of all values in range of series
&&xi= x1+x2+...+xn
double summation
capital pi
product - product of all values in range of series
&&xi=x1?x2?...?xn
&/ Euler's number
e&= lim (1+1/x)x&,&x&&
golden ratio
golden ratio constant
Linear Algebra Symbols
SymbolSymbol NameMeaning / definitionExample
scalar product
vector product
tensor product
tensor product of A and B
inner product
matrix of numbers
parentheses
matrix of numbers
determinant
determinant of matrix A
determinant
determinant of matrix A
double vertical bars
matrix transpose
(AT)ij&= (A)ji
Hermitian matrix
matrix conjugate transpose
(A&)ij&= (A)ji
Hermitian matrix
matrix conjugate transpose
(A*)ij&= (A)ji
inverse matrix
matrix rank
rank of matrix A
rank(A) = 3
dimension of matrix A
rank(U) = 3
Probability and statistics symbols
SymbolSymbol NameMeaning / definitionExample
probability function
probability of event A
P(A) = 0.5
probability of events intersection
probability that of events A and B
P(A&B) = 0.5
probability of events union
probability that of events A or B
P(A&B) = 0.5
conditional probability function
probability of event A given event B occured
P(A | B) = 0.3
probability density function (pdf)
P(a&&&x&&&b) =&& f&(x)&dx
cumulative distribution function (cdf)
F(x) =&P(X&&&x)
population mean
mean of population values
expected value of random variable X
conditional expectation
expected value of random variable X given Y
E(X | Y=2) = 5
variance of random variable X
var(X) = 4
variance of population values
standard deviation of random variable X
std(X) = 2
standard deviation value of random variable X
middle value of random variable x
covariance
covariance of random variables X and Y
cov(X,Y) = 4
correlation
correlation of random variables X and Y
corr(X,Y) = 3
correlation
correlation of random variables X and Y
summation - sum of all values in range of series
double summation
double summation
value that occurs most frequently in population
MR&= (xmax+xmin)/2
sample median
half the population is below this value
lower / first quartile
25% of population are below this value
median / second quartile
50% of population are below this value = median of samples
upper / third quartile
75% of population are below this value
sample mean
average / arithmetic mean
x&= (2+5+9) / 3 = 5.333
sample variance
population samples variance estimator
sample standard deviation
population samples standard deviation estimator
standard score
zx&= (x-x) /&sx
distribution of random variable X
X&~&N(0,3)
gaussian distribution
X&~&N(0,3)
uniform distribution
equal probability in range a,b&
X&~&U(0,3)
exponential distribution
f&(x)&= &e-&x&,&x&0
gamma(c, &)
gamma distribution
f&(x)&= & c xc-1e-&x&/ &G(c),x&0
chi-square distribution
f&(x)&= xk/2-1e-x/2&/ ( 2k/2&G(k/2) )
F&(k1, k2)
F distribution
binomial distribution
f&(k)&=&nCk&pk(1-p)n-k
Poisson(&)
Poisson distribution
f&(k)&= &ke-&&/&k!
geometric distribution
f&(k)&=& p&(1-p)&k
hyper-geometric distribution
Bernoulli distribution
Combinatorics Symbols
SymbolSymbol NameMeaning / definitionExample
n! = 1&2&3&...&n
5! = 1&2&3&4&5 = 120
permutation
5P3&=&5! / (5-3)! = 60
combination
5C3&=&5!/[3!(5-3)!]=10
Set theory symbols
SymbolSymbol NameMeaning / definitionExample
a collection of elements
A={3,7,9,14}, B={9,14,28}
intersection
objects that belong to set A and set B
A&&&B = {9,14}
objects that belong to set A or set B
A&&&B = {3,7,9,14,28}
subset has less elements or equal to the set
{9,14,28}&&&{9,14,28}
proper subset / strict subset
subset has less elements than the set
{9,14}&&&{9,14,28}
not subset
left set not a subset of right set
{9,66}&&&{9,14,28}
set A has more elements or equal to the set B
{9,14,28}&&&{9,14,28}
proper superset / strict superset
set A has more elements than set B
{9,14,28}&&&{9,14}
not superset
set A is not a superset of set B
{9,14,28}&?&{9,66}
all subsets of A
all subsets of A
both sets have the same members
A={3,9,14}, B={3,9,14}, A=B
complement
all the objects that do not belong to set A
relative complement
objects that belong to A and not to B
A={3,9,14},&&&& B={1,2,3}, A-B={9,14}
relative complement
objects that belong to A and not to B
A={3,9,14},&&&& B={1,2,3}, A-B={9,14}
symmetric difference
objects that belong to A or B but not to their intersection
A={3,9,14},&&&& B={1,2,3}, A ? B={1,2,9,14}
symmetric difference
objects that belong to A or B but not to their intersection
A={3,9,14},&&&& B={1,2,3}, A&?B={1,2,9,14}
element of
set membership
A={3,9,14}, 3&&&A
not element of
no set membership
A={3,9,14}, 1&&&A
ordered pair
collection of 2 elements
cartesian product
set of all ordered pairs from A and B
cardinality
the number of elements of set A
A={3,9,14}, |A|=3
cardinality
the number of elements of set A
A={3,9,14}, #A=3
infinite cardinality
universal set
set of all possible values
natural numbers set (with zero)
N0&= {0,1,2,3,4,...}
natural numbers set (without zero)
N1&= {1,2,3,4,5,...}
integer numbers set
Z&= {...-3,-2,-1,0,1,2,3,...}
rational numbers set
Q&= {x&|&x=a/b,&a,b&N}
real numbers set
R&= {x&| -& &&x&&&}
6.343434&& R
complex numbers set
C&= {z&|&z=a+bi, -&&a&&,&&&&& -&&b&&}
Logic symbols
SymbolSymbol NameMeaning / definitionExample
caret / circumflex
reversed caret
vertical line
single quote
not - negation
not - negation
not - negation
exclamation mark
not - negation
circled plus / oplus
exclusive or - xor
equivalent
if and only if
there exists
there does not exists
because / since
Calculus & analysis symbols
SymbolSymbol NameMeaning / definitionExample
limit value of a function
represents a very small number, near zero
&/ Euler's number
e&= lim (1+1/x)x&,&x&&
derivative - Leibniz's notation
(3x3)' = 9x2
second derivative
derivative of derivative
(3x3)'' = 18x
nth derivative
n times derivation
(3x3)(3)&= 18
derivative - Lagrange's notation
d(3x3)/dx&= 9x2
second derivative
derivative of derivative
d2(3x3)/dx2&= 18x
nth derivative
n times derivation
time derivative
derivative by time - Newton notation
time second derivative
derivative of derivative
partial derivative
&(x2+y2)/&x&= 2x
opposite to derivation
double integral
integration of function of 2 variables
triple integral
integration of function of 3 variables
closed contour / line integral
closed surface integral
closed volume integral
closed interval
[a,b] = {x&|&a&&&x&&&b}
open interval
(a,b) = {x&|&a&&&x&&&b}
imaginary unit
z&= 3 + 2i
complex conjugate
z&=&a+bi&&&z*=a-bi
z*&= 3 + 2i
complex conjugate
z&=&a+bi&&&z&=&a-bi
z&= 3 + 2i
nabla / del
gradient / divergence operator
&f&(x,y,z)
unit vector
y(t) =&x(t) *&h(t)
F(s) =&L{f&(t)}
Fourier transform
X(&) =&F{f&(t)}
delta function
Numeral symbols
NameEuropeanRomanHindu ArabicHebrew
one hundred
Greek alphabet letters
Greek SymbolGreek Letter NameEnglish EquivalentPronunciation
Upper CaseLower Case
o-mee-c-ron
oo-psi-lon
Roman numerals
NumberRoman numeral
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