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