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Set theory symbols

List of Set theory symbols
Source: https://www.rapidtables.com/math/symbols/Basic_Math_Symbols.html#lnkset
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Symbol: A×B
Symbol Name: cartesian product
Meaning / definition: set of all ordered pairs from A and B
Example:
Symbol: │A│
Symbol Name: cardinality
Meaning / definition: the number of elements of set A
Example: A={3,9,14}, │A│=3
Symbol: #A
Symbol Name: cardinality
Meaning / definition: the number of elements of set A
Example: A={3,9,14}, #A=3
Symbol:
Symbol Name: vertical bar
Meaning / definition: such that
Example: A={x│3<x<14}
Symbol:
Symbol Name: aleph-null
Meaning / definition: infinite cardinality of natural numbers set
Example:
Symbol:
Symbol Name: aleph-one
Meaning / definition: cardinality of countable ordinal numbers set
Example:
Symbol: Ø
Symbol Name: empty set
Meaning / definition: Ø = { }
Example: C = {Ø}
Symbol:
Symbol Name: universal set
Meaning / definition: set of all possible values
Example:
Symbol: 0
Symbol Name: natural numbers / whole numbers  set (with zero)
Meaning / definition: 0 = {0,1,2,3,4,...}
Example: 0 ∈ 0
Symbol: 1
Symbol Name: natural numbers / whole numbers  set (without zero)
Meaning / definition: 1 = {1,2,3,4,5,...}
Example: 6 ∈ 1
Symbol:
Symbol Name: integer numbers set
Meaning / definition: = {...-3,-2,-1,0,1,2,3,...}
Example: -6 ∈
Symbol:
Symbol Name: rational numbers set
Meaning / definition: = {x x=a/b, a,b}
Example: 2/6 ∈