LEFT SQUARE BRACKET EXTENSION is one of the 256 characters in the Miscellaneous Technical Unicode subset.
The image below shows how the LEFT SQUARE BRACKET EXTENSION 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 SQUARE BRACKET EXTENSION symbol, you can use the image below to get an idea of what it should look like.
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