PLUS-MINUS SIGN is one of the 128 characters in the Latin-1 Supplement Unicode subset.
The image below shows how the PLUS-MINUS SIGN 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 PLUS-MINUS SIGN symbol, you can use the image below to get an idea of what it should look like.
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