LEFT SQUARE BRACKET WITH TICK IN BOTTOM CORNER is one of the 128 characters in the Miscellaneous Mathematical Symbols-B Unicode subset.
The image below shows how the LEFT SQUARE BRACKET WITH TICK IN BOTTOM CORNER 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 WITH TICK IN BOTTOM CORNER symbol, you can use the image below to get an idea of what it should look like.
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