U+2135 Alef Symbol
U+2135 was added in Unicode version 1.1 in 1993. It belongs to the block
This character is a Other Letter and is commonly used, that is, in no specific script. The character is also known as first transfinite cardinal (countable).
The glyph is a compatibility version of the glyph
The Wikipedia has the following information about this codepoint:
In mathematics, particularly in set theory, the aleph numbers are a sequence of numbers used to represent the cardinality (or size) of infinite sets that can be wellordered. They were introduced by the mathematician Georg Cantor and are named after the symbol he used to denote them, the Hebrew letter aleph ($\phantom{\rule{thinmathspace}{0ex}}\aleph \phantom{\rule{thinmathspace}{0ex}}$).
The cardinality of the natural numbers is $\phantom{\rule{thinmathspace}{0ex}}{\aleph}_{0}\phantom{\rule{thinmathspace}{0ex}}$ (read alephnought or alephzero; the term alephnull is also sometimes used), the next larger cardinality of a wellordered set is alephone $\phantom{\rule{thinmathspace}{0ex}}{\aleph}_{1}\phantom{\rule{thickmathspace}{0ex}},$ then $\phantom{\rule{thinmathspace}{0ex}}{\aleph}_{2}\phantom{\rule{thinmathspace}{0ex}}$ and so on. Continuing in this manner, it is possible to define a cardinal number $\phantom{\rule{thinmathspace}{0ex}}{\aleph}_{\alpha}\phantom{\rule{thinmathspace}{0ex}}$ for every ordinal number $\phantom{\rule{thinmathspace}{0ex}}\alpha \phantom{\rule{thickmathspace}{0ex}},$ as described below.
The concept and notation are due to Georg Cantor, who defined the notion of cardinality and realized that infinite sets can have different cardinalities.
The aleph numbers differ from the infinity ($\phantom{\rule{thinmathspace}{0ex}}\infty \phantom{\rule{thinmathspace}{0ex}}$) commonly found in algebra and calculus, in that the alephs measure the sizes of sets, while infinity is commonly defined either as an extreme limit of the real number line (applied to a function or sequence that "diverges to infinity" or "increases without bound"), or as an extreme point of the extended real number line.
Representations
System  Representation 

Nº  8501 
UTF8  E2 84 B5 
UTF16  21 35 
UTF32  00 00 21 35 
URLQuoted  %E2%84%B5 
HTML hex reference  ℵ 
Wrong windows1252 Mojibake  â„µ 
HTML named entity  ℵ 
HTML named entity  ℵ 
alias  first transfinite cardinal (countable) 
L^{A}T_{E}X  \aleph 
Adobe Glyph List  aleph 
Related Characters
Confusables
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
ALEF SYMBOL  
FIRST TRANSFINITE CARDINAL  
Letterlike Symbols  
Other Letter  
Common  
Left To Right  
Not Reordered  
compatibility  


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