Index
 Greek letters in math and science
 Doublestruck capital letters in math
 Constants
 Table of set theory symbols
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Greek letters in math and science
You find hese symbols my equation page.
I took this from Wiki and adjusted it with comments that I find useful.
Symbol  Name 
Formula 
Αα  Alpha  
Ββ  Beta  
Χχ  Chi  
Εε  Epsilon  
Δ δ=  Delta  
Ηη  Eta  
δ  Kronecker delta  EFE Einstein Field equations. 
∂ 
Curly d  In partial derivatives 
Gamma 


Ιι  Iota  
Κκ  Kappa  
Λλ  Lambda  
Μμ  Mu  
Νν  Nu  
Οο  Omicron  
Ωω  Omega  
Ππ  Pi
(product) 

Φφ  
Ψψ  Psi  
Ρρ  Rho  
Ζζ  Zeta  

Re. = Ramanujan summation. 
Ramanujan summation. ( Wiki ) 
Σσ 
Sigma 

Ττ  Tau  
Θθ  Theta  
Ξξ  Xi  
Υυ  Upsilon  
Zeta 
ζ(s) = 1 + 1/2^{s} + 1/3^{s} + 1/4^{s} + … Riemann’s zeta function 

~  About  
!  factorial  4!=4*3*2*1 
≠ 
not equal  
∞ 
infinity  
∫  Integral 

Source: Wiki
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Doublestruck capital letters in math
Source: http://xahlee.info/comp/unicode_math_font.html
Meaning in Math
 ℤ → integers.
 ℕ → natural numbers.
 ℙ → primes.
 ℚ → be rational.
 ℝ → get real.
 ℂ → complex number.
 ℍ → quaternions.
 → sedenions.
 ℑ → imaginary part
 ℜ → real part
 ⅅ → Derivative
 ⅆ → Differential
 ⅇ → euler’s number (natural growth number)
 ⅈ → imaginary unit.
 ⅉ → notation used by engineers for ⅈ
 ℵ → cardinality of infinite sets.
 ℭ → continuum
Constants
Most information has been taken from
https://www.forbes.com/sites/ethansiegel/2015/08/22/ittakes26fundamentalconstantstogiveusouruniversebuttheystilldontgiveeverything/#2174185a4b86 that links to Wikipedia
Physical constants
C  Value 
Name  Formula 
C  299.792.458 m/s ~300.000 km/s 
Speed of light  E=mc^{2}

6.62607015×10^{−34} J⋅s^{}  Plancks constant
“to calculate the energy of the electromagnetic wave” 
E=hf


k_{B}  1.38065 × 10^{−23} J/K  Boltzmann constant
Boltzmanns entropy formula 

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Table of set theory symbols
Taken and adapted from www.rapidtables.com
Symbol  Symbol Name  Meaning / definition 
Example 

{ }  set  a collection of elements  A = {3,7,9,14}, B = {9,14,28} 
  such that  so that  A = {x  x∈, x<0} 
A⋂B  intersection  objects that belong to set A and set B  A ⋂ B = {9,14} 
A⋃B  union  objects that belong to set A or set B  A ⋃ B = {3,7,9,14,28} 
A⊆B  subset  A is a subset of B. set A is included in set B.  {9,14,28} ⊆ {9,14,28} 
A⊂B  proper subset / strict subset  A is a subset of B, but A is not equal to B.  {9,14} ⊂ {9,14,28} 
A⊄B  not subset  set A is not a subset of set B  {9,66} ⊄ {9,14,28} 
A⊇B  superset  A is a superset of B. set A includes set B  {9,14,28} ⊇ {9,14,28} 
A⊃B  proper superset / strict superset  A is a superset of B, but B is not equal to A.  {9,14,28} ⊃ {9,14} 
A⊅B  not superset  set A is not a superset of set B  {9,14,28} ⊅ {9,66} 
2^{A}  power set  all subsets of A  
power set  all subsets of A  
A=B  equality  both sets have the same members  A={3,9,14}, B={3,9,14}, A=B 
A^{c}  complement  all the objects that do not belong to set A  
A’  complement  all the objects that do not belong to set A  
A\B  relative complement  objects that belong to A and not to B  A = {3,9,14}, B = {1,2,3}, A \ B = {9,14} 
AB  relative complement  objects that belong to A and not to B  A = {3,9,14}, B = {1,2,3}, A – B = {9,14} 
A∆B  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} 
A⊖B  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} 
a∈A  element of, belongs to 
set membership  A={3,9,14}, 3 ∈ A 
x∉A  not element of  no set membership  A={3,9,14}, 1 ∉ A 
(a,b)  ordered pair  collection of 2 elements  
A×B  cartesian product  set of all ordered pairs from A and B  
A  cardinality  the number of elements of set A  A={3,9,14}, A=3 
#A  cardinality  the number of elements of set A  A={3,9,14}, #A=3 
  vertical bar  such that  A={x3<x<14} 
≡  congruency  3 is cogruent to 15 in modulo 12 (modular arithmetic) 
3 ≡ 15 (mod12) 
ℵ_{0}  alephnull  infinite cardinality of natural numbers set  
ℵ_{1}  alephone  cardinality of countable ordinal numbers set  
Ø  empty set  Ø = {}  A = Ø 
universal set  set of all possible values  
ℕ_{0}  natural numbers / whole numbers set (with zero)  _{0} = {0,1,2,3,4,…}  0 ∈ _{0} 
ℕ_{1}  natural numbers / whole numbers set (without zero)  _{1} = {1,2,3,4,5,…}  6 ∈ _{1} 
ℤ  integer numbers set  = {…3,2,1,0,1,2,3,…}  6 ∈ 
ℚ  rational numbers set  = {x  x=a/b, a,b∈ and b≠0}  2/6 ∈ 
ℝ  real numbers set  = {x  ∞ < x <∞}  6.343434 ∈ 
ℂ  complex numbers set  = {z  z=a+bi, ∞<a<∞, ∞<b<∞}  6+2i ∈ 