DOUBLE WAVY OVERLINE is one of the 32 characters in the CJK Compatibility Forms Unicode subset.
The image below shows how the DOUBLE WAVY OVERLINE 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 DOUBLE WAVY OVERLINE symbol, you can use the image below to get an idea of what it should look like.
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