U+1D4B9 Mathematical Script Small D
U+1D4B9 was added in Unicode version 3.1 in 2001. It belongs to the block
This character is a Lowercase Letter and is commonly used, that is, in no specific script.
The glyph is a font version of the glyph
The Wikipedia has the following information about this codepoint:
Mathematical Alphanumeric Symbols is a Unicode block comprising styled forms of Latin and Greek letters and decimal digits that enable mathematicians to denote different notions with different letter styles. The letters in various fonts often have specific, fixed meanings in particular areas of mathematics. By providing uniformity over numerous mathematical articles and books, these conventions help to read mathematical formulas. These also may be used to differentiate between concepts that share a letter in a single problem.
Unicode now includes many such symbols (in the range U+1D400βU+1D7FF).Β The rationale behind this is that it enables design and usage of special mathematical characters (fonts) that include all necessary properties to differentiate from other alphanumerics, e.g. in mathematics an italic "π΄" can have a different meaning from a roman letter "A". Unicode originally included a limited set of such letter forms in its Letterlike Symbols block before completing the set of Latin and Greek letter forms in this block beginning in version 3.1.
Unicode expressly recommends that these characters not be used in general text as a substitute for presentational markup; the letters are specifically designed to be semantically different from each other. Unicode does not include a set of normal serif letters in the set. Still they have found some usage on social media, for example by people who want a stylized user name, and in email spam, in an attempt to bypass filters.
All these letter shapes may be manipulated with MathML's attribute mathvariant.
The introduction date of some of the more commonly used symbols can be found in the Table of mathematical symbols by introduction date.
Representations
System  Representation 

NΒΊ  119993 
UTF8  F0 9D 92 B9 
UTF16  D8 35 DC B9 
UTF32  00 01 D4 B9 
URLQuoted  %F0%9D%92%B9 
HTML hex reference  𝒹 
Wrong windows1252 Mojibake  Γ°ΒβΒΉ 
HTML named entity  𝒹 
L^{A}T_{E}X  \mathscr{d} 
Related Characters
Confusables
Elsewhere
Complete Record
Property  Value 

3.1 (2001)  
MATHEMATICAL SCRIPT SMALL D  
β  
Mathematical Alphanumeric Symbols  
Lowercase Letter  
Common  
Left To Right  
Not Reordered  
font  


β  




β  










β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  


Any  
β  
β  
β  
β  
β  
β  
β  
β  
β  
0  
0  
0  
β  
None  
β  
NA  
Other  
β  
β  
β  
β  
β  
Yes  
Yes  


No  


No  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
β  
Lower  
β  
β  
β  
β  
β  
Alphabetic Letter  
β  
β  
β  
β  
β  
β  
β  


None  
neutral  
Not Applicable  
β  
No_Joining_Group  
Non Joining  
Alphabetic  
none  
not a number  


R 