CIRCLED NUMBER THIRTY is one of the 256 characters in the Enclosed CJK Letters and Months Unicode subset.
The image below shows how the CIRCLED NUMBER THIRTY 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 CIRCLED NUMBER THIRTY symbol, you can use the image below to get an idea of what it should look like.
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