UP DOWN BLACK ARROW is one of the 256 characters in the Miscellaneous Symbols and Arrows Unicode subset.
The image below shows how the UP DOWN BLACK 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 UP DOWN BLACK ARROW symbol, you can use the image below to get an idea of what it should look like.
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