MATHEMATICAL MONOSPACE DIGIT FOUR is one of the 1024 characters in the Mathematical Alphanumeric Symbols Unicode subset.
The image below shows how the MATHEMATICAL MONOSPACE DIGIT FOUR 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 MATHEMATICAL MONOSPACE DIGIT FOUR symbol, you can use the image below to get an idea of what it should look like.
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