* ES3 における定義

[12] 
>The phrase “[[Unicode character]]” will be used to refer to the abstract linguistic or typographical unit
represented by a single [[Unicode scalar value]] (which may be longer than 16 bits and thus may be represented
by more than one [[code point]]). This only refers to entities represented by single [[Unicode scalar values]]:
the components of a [[combining character sequence]] are still individual “[[Unicode characters]],”
even though a [[user]] might think of the whole sequence as a single [[character]].

;; [15] [CITE[ECMAScript Language Specification (HTML version)]] ([TIME[2009-04-03 04:43:48 +09:00]] 版) <http://bclary.com/2004/11/07/#a-6>

[13] [[ES3]] 仕様書では[[16ビット符号単位]]に「[[文字]]」という語を当てているため、
[[Unicode]] における本来の「[[文字]]」の意味で「[[Unicode文字]]」という語を用いています。

* HTML における定義

** 定義

[19] 
> The term [DFN[[[Unicode character]]]] is used to mean a [[Unicode scalar value]] (i.e. any Unicode code point that is not a surrogate code point).

** 仕様書

- [16] [[Web Applications 1.0]]
-- [17] <http://www.whatwg.org/specs/web-apps/current-work/complete.html#character-encodings>

** 歴史

[14] [CITE@en[(X)HTML5 Tracking]]
([TIME[2009-09-16 23:13:02 +09:00]] 版)
<http://html5.org/tools/web-apps-tracker?from=3871&to=3872>

;; [18] ここで定義が追加されました。