DOUBLE INTEGRAL is one of the 256 characters in the Mathematical Operators Unicode subset.
The image below shows how the DOUBLE INTEGRAL 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 DOUBLE INTEGRAL symbol, you can use the image below to get an idea of what it should look like.
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