LEFT SUBSTITUTION BRACKET is one of the 128 characters in the Supplemental Punctuation Unicode subset.
The image below shows how the LEFT SUBSTITUTION BRACKET 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 LEFT SUBSTITUTION BRACKET symbol, you can use the image below to get an idea of what it should look like.
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