LONG LEFTWARDS DOUBLE ARROW is one of the 16 characters in the Supplemental Arrows-A Unicode subset.
The image below shows how the LONG LEFTWARDS DOUBLE ARROW 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 LONG LEFTWARDS DOUBLE ARROW symbol, you can use the image below to get an idea of what it should look like.
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