U+2239 Excess
U+2239 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 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 mirrored. The word that U+2239 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Spherical trigonometry is the branch of spherical geometry that deals with the metrical relationships between the sides and angles of spherical triangles, traditionally expressed using trigonometric functions. On the sphere, geodesics are great circles. Spherical trigonometry is of great importance for calculations in astronomy, geodesy, and navigation.
The origins of spherical trigonometry in Greek mathematics and the major developments in Islamic mathematics are discussed fully in History of trigonometry and Mathematics in medieval Islam. The subject came to fruition in Early Modern times with important developments by John Napier, Delambre and others, and attained an essentially complete form by the end of the nineteenth century with the publication of Todhunter's textbook Spherical trigonometry for the use of colleges and Schools. Since then, significant developments have been the application of vector methods, quaternion methods, and the use of numerical methods.
Representations
System  Representation 

Nº  8761 
UTF8  E2 88 B9 
UTF16  22 39 
UTF32  00 00 22 39 
URLQuoted  %E2%88%B9 
HTML hex reference  ∹ 
Wrong windows1252 Mojibake  âˆ¹ 
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
EXCESS  
—  
Mathematical Operators  
Math Symbol  
Common  
Other Neutral  
Not Reordered  
none  


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Any  
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0  
0  
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None  
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NA  
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Yes  
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None  
neutral  
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—  
No_Joining_Group  
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Alphabetic  
none  
not a number  


R 