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