U+2A1B Integral with Overbar
U+2A1B was added to Unicode in version 3.2 (2002). 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 upper integral.
The glyph is not a composition. It has a Neutral East Asian Width. In bidirectional context it acts as Other Neutral and is mirrored. In text U+2A1B 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 the branch of mathematics known as real analysis, the Darboux integral is constructed using Darboux sums and is one possible definition of the integral of a function. Darboux integrals are equivalent to Riemann integrals, meaning that a function is Darbouxintegrable if and only if it is Riemannintegrable, and the values of the two integrals, if they exist, are equal. The definition of the Darboux integral has the advantage of being easier to apply in computations or proofs than that of the Riemann integral. Consequently, introductory textbooks on calculus and real analysis often develop Riemann integration using the Darboux integral, rather than the true Riemann integral. Moreover, the definition is readily extended to defining Riemann–Stieltjes integration. Darboux integrals are named after their inventor, Gaston Darboux (1842–1917).
Representations
System  Representation 

Nº  10779 
UTF8  E2 A8 9B 
UTF16  2A 1B 
UTF32  00 00 2A 1B 
URLQuoted  %E2%A8%9B 
HTML hex reference  ⨛ 
Wrong windows1252 Mojibake  â¨› 
alias  upper integral 
Elsewhere
Complete Record
Property  Value 

3.2 (2002)  
INTEGRAL WITH OVERBAR  
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Supplemental ArrowsC  
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R 