[1]

A single Unicode code point is denoted by "U+" followed by four to six hexadecimal digits, while a range of Unicode code points is denoted by two hexadecimal numbers separated by "..", with no prefixes.

[4] RFC 5890 - Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework ( (2011-02-05 07:34:19 +09:00 版)) http://tools.ietf.org/html/rfc5890#section-2.1

[5] Unicode Mail List Archive: Re: Origin of the U+nnnn notation ( (Kenneth Whistler (kenw@sybase.com) 著, 2005-11-09 16:55:17 +09:00 版)) http://unicode.org/mail-arch/unicode-ml/y2005-m11/0060.html

[6] Selector parsing: It's easy to hit unexpected unicode-range tokens ( (Boris Zbarsky 著, 2014-06-30 23:34:31 +09:00 版)) http://lists.w3.org/Archives/Public/www-style/2014Jun/0486.html

[7] [css-syntax][css-fonts] Wrapping up the <unicode-range> thing (Tab Atkins Jr. 著, 2015-06-23 09:26:08 +09:00 版) https://lists.w3.org/Archives/Public/www-style/2015Jun/0286.html

[8] 多符号化対応w3mの追加設定項目 (2020-10-25T00:24:23.000Z) http://pub.ks-and-ks.ne.jp/prog/w3mmee/config.shtml.ja#non-ucs

• [11] CID+, C+ : Adobe CID
• [10] J+ : 住基ネット統一文字コード
• [13] N+ : 入管正字
• [12] V+ : 越南