U+21A3 Rightwards Arrow with Tail
U+21A3 was added in Unicode version 1.1 in 1993. It belongs to the block
This character is a Math Symbol and is commonly used, that is, in no specific script. The character is also known as z notation total injection.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+21A3 forms with similar adjacent characters prevents a line break inside it.
The CLDR project calls this character “rightwards arrow tail” for use in screen reading software.
The Wikipedia has the following information about this codepoint:
In mathematics, an injective function (also known as injection, or onetoone function ) is a function f that maps distinct elements of its domain to distinct elements; that is, x_{1} ≠ x_{2} implies f(x_{1}) ≠ f(x_{2}). (Equivalently, f(x_{1}) = f(x_{2}) implies x_{1} = x_{2} in the equivalent contrapositive statement.) In other words, every element of the function's codomain is the image of at most one element of its domain. The term onetoone function must not be confused with onetoone correspondence that refers to bijective functions, which are functions such that each element in the codomain is an image of exactly one element in the domain.
A homomorphism between algebraic structures is a function that is compatible with the operations of the structures. For all common algebraic structures, and, in particular for vector spaces, an injective homomorphism is also called a monomorphism. However, in the more general context of category theory, the definition of a monomorphism differs from that of an injective homomorphism. This is thus a theorem that they are equivalent for algebraic structures; see Homomorphism § Monomorphism for more details.
A function $f$ that is not injective is sometimes called manytoone.
Representations
System  Representation 

Nº  8611 
UTF8  E2 86 A3 
UTF16  21 A3 
UTF32  00 00 21 A3 
URLQuoted  %E2%86%A3 
HTML hex reference  ↣ 
Wrong windows1252 Mojibake  â†£ 
HTML named entity  ↣ 
HTML named entity  ↣ 
alias  z notation total injection 
L^{A}T_{E}X  \rightarrowtail 
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
RIGHTWARDS ARROW WITH TAIL  
RIGHT ARROW WITH TAIL  
Arrows  
Math Symbol  
Common  
Other Neutral  
Not Reordered  
none  


✘  




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Any  
✔  
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0  
0  
0  
✘  
None  
—  
NA  
Other  
—  
✘  
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✔  
✘  
Yes  
Yes  


Yes  


Yes  
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Other  
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Other  
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None  
neutral  
Not Applicable  
—  
No_Joining_Group  
Non Joining  
Alphabetic  
none  
not a number  


R 