APL FUNCTIONAL SYMBOL QUAD DOWNWARDS ARROW is one of the 256 characters in the Miscellaneous Technical Unicode subset.
The image below shows how the APL FUNCTIONAL SYMBOL QUAD DOWNWARDS 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 APL FUNCTIONAL SYMBOL QUAD DOWNWARDS ARROW symbol, you can use the image below to get an idea of what it should look like.
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