INTEGRAL WITH UNDERBAR is one of the 256 characters in the Supplemental Mathematical Operators Unicode subset.
The image below shows how the INTEGRAL WITH UNDERBAR symbol looks like in some of the most complete UTF-8 fonts: Code2000, Sun-ExtA, WenQuanYi Zen Hei and GNU Unifont. If the font in which this web site is displayed does not contain the INTEGRAL WITH UNDERBAR symbol, you can use the image below to get an idea of what it should look like.
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