KHMER VOWEL SIGN AU is one of the 128 characters in the Khmer Unicode subset.
The image below shows how the KHMER VOWEL SIGN AU 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 KHMER VOWEL SIGN AU symbol, you can use the image below to get an idea of what it should look like.
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