SUBSCRIPT PLUS SIGN is one of the 48 characters in the Superscripts and Subscripts Unicode subset.
The image below shows how the SUBSCRIPT PLUS 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 SUBSCRIPT PLUS SIGN symbol, you can use the image below to get an idea of what it should look like.
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