SQUARE WITH UPPER LEFT TO LOWER RIGHT FILL is one of the 96 characters in the Geometric Shapes Unicode subset.
The image below shows how the SQUARE WITH UPPER LEFT TO LOWER RIGHT FILL 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 SQUARE WITH UPPER LEFT TO LOWER RIGHT FILL symbol, you can use the image below to get an idea of what it should look like.
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