U+25DB LOWER HALF INVERSE WHITE CIRCLE
U+25DB was added to Unicode in version 1.1 (1993). It belongs to the block
This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. It has a Neutral East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. In text U+25DB behaves as Alphabetic regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.
The Wikipedia has the following information about this codepoint:
In mathematics (and more specifically geometry), a semicircle is a onedimensional locus of points that forms half of a circle. The full arc of a semicircle always measures 180° (equivalently, π radians, or a halfturn). It has only one line of symmetry (reflection symmetry). In nontechnical usage, the term "semicircle" is sometimes used to refer to a halfdisk, which is a twodimensional geometric shape that also includes the diameter segment from one end of the arc to the other as well as all the interior points.
By Thales' theorem, any triangle inscribed in a semicircle with a vertex at each of the endpoints of the semicircle and the third vertex elsewhere on the semicircle is a right triangle, with right angle at the third vertex.
All lines intersecting the semicircle perpendicularly are concurrent at the center of the circle containing the given semicircle.
Representations
System  Representation 

Nº  9691 
UTF8  E2 97 9B 
UTF16  25 DB 
UTF32  00 00 25 DB 
URLQuoted  %E2%97%9B 
HTMLEscape  ◛ 
Wrong windows1252 Mojibake  â 
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
LOWER HALF INVERSE WHITE CIRCLE  
—  
Geometric Shapes  
Other Symbol  
Common  
Other Neutral  
Not Reordered  
None  


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NA  
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None  
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Alphabetic  
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not a number  


U 