U+FFDFF is one of the 65534 characters in the Supplementary Private Use Area-A Unicode subset.
The image below shows how the U+FFDFF 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 U+FFDFF symbol, you can use the image below to get an idea of what it should look like.
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