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  • This is not what OP meant. Commented Mar 28, 2013 at 13:58
  • @DavinTryon: Can you think of any ASCII characters that aren't contained in, say, UTF-8? I can think of many characters in UTF-8 that aren't in ASCII. For example the character 字 cannot be represented in US-ASCII. Commented Mar 29, 2013 at 2:08
  • Yes, but saying that it is a subset is not correct. UTF-8 (only one of the unicode formats) was explicitly created to be "backwards compatible" with ASCII. Commented Mar 29, 2013 at 21:42
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    @DavinTryon: What definition of subset are you using? Every codepoint in ASCII is contained in Unicode. ASCII is therefore completely contained within Unicode, or in other words, ASCII is a subset of Unicode. That's not to say Unicode predates ASCII, merely that it contains every element in ASCII (after all, that's what subset means). Commented Mar 30, 2013 at 13:15