此條目介紹的是收录缺字字符的Unicode区段。关于表示无法辨认或无法查明的字的标点符号,请见「
虚缺号 」。
特殊字符是Unicode的一个简短的区段,分配在基本多文种平面的最末端,位于U+FFF0-FFFF。在这16个码位中,有5个是从Unicode 3.0开始分配的。
U+FFF9 行间注解锚,标志着注解文本的开始。
U+FFFA 行间注解分隔符,标记注解字符的开始。
U+FFFB 行间注解終止符,标志着注解块的结束。
U+FFFC  OBJECT REPLACEMENT CHARACTER,在文本中为另一个未指定的对象提供占位符,例如在一个复合文件中。
U+FFFD � REPLACEMENT CHARACTER(替换字符),用于替换一个未知的、不被认可的或无法表示的字符。
U+FFFE <非字符-FFFE> 不是一个字符。
U+FFFF <非字符-FFFF> 不是一个字符。
FFFE和FFFF不是通常意义上的未分配字符,但不是Unicode字符。它们可以用来猜测一个文本的编码方案,因为根据定义,任何包含这些的文本都不是一个正确编码的Unicode文本。Unicode的U+FEFF BYTE ORDER MARK字符可以插在Unicode文本的开头,以表示它的字节性:一个程序在阅读这样的文本并遇到0xFFFE时,就会知道它应该为后面的所有字符转换字节顺序。
它在Unicode 1.0中的区段名是特殊。[ 3]
歷史
以下Unicode文檔記錄了定義本區塊中特定字符的目的與過程:
版本
最終碼位[ a]
碼位数
L2 ID
WG2 ID
文檔
1.0.0
U+FFFD
1
(to be determined)
U+FFFE..FFFF
2
(to be determined)
L2/01-295R
Moore, Lisa, Motion 88-M2, Minutes from the UTC/L2 meeting #88, 2001-11-06
L2/01-355
N2369 (html , doc (页面存档备份 ,存于互联网档案馆 ))
Davis, Mark , Request to allow FFFF, FFFE in UTF-8 in the text of ISO/IEC 10646, 2001-09-26
L2/02-154
N2403 (页面存档备份 ,存于互联网档案馆 )
Umamaheswaran, V. S., 9.3 Allowing FFFF and FFFE in UTF-8, Draft minutes of WG 2 meeting 41, Hotel Phoenix, Singapore, 2001-10-15/19, 2002-04-22
2.1
U+FFFC
1
UTC/1995-056
Sargent, Murray, Recommendation to encode a WCH_EMBEDDING character, 1995-12-06
UTC/1996-002
Aliprand, Joan; Hart, Edwin; Greenfield, Steve, Embedded Objects, UTC #67 Minutes, 1996-03-05
N1365
Sargent, Murray, Proposal Summary – Object Replacement Character, 1996-03-18
N1353 (页面存档备份 ,存于互联网档案馆 )
Umamaheswaran, V. S.; Ksar, Mike, 8.14, Draft minutes of WG2 Copenhagen Meeting # 30, 1996-06-25
L2/97-288
N1603 (页面存档备份 ,存于互联网档案馆 )
Umamaheswaran, V. S., 7.3, Unconfirmed Meeting Minutes, WG 2 Meeting # 33, Heraklion, Crete, Greece, 20 June – 4 July 1997, 1997-10-24
L2/98-004R
N1681
Text of ISO 10646 – AMD 18 for PDAM registration and FPDAM ballot, 1997-12-22
L2/98-070
Aliprand, Joan; Winkler, Arnold, Additional comments regarding 2.1, Minutes of the joint UTC and L2 meeting from the meeting in Cupertino, February 25-27, 1998
L2/98-318
N1894 (页面存档备份 ,存于互联网档案馆 )
Revised text of 10646-1/FPDAM 18, AMENDMENT 18: Symbols and Others, 1998-10-22
3.0
U+FFF9..FFFB
3
L2/97-255R
Aliprand, Joan, 3.D Proposal for In-Line Notation (ruby), Approved Minutes – UTC #73 & L2 #170 joint meeting, Palo Alto, CA – August 4-5, 1997, 1997-12-03
L2/98-055
Freytag, Asmus, Support for Implementing Inline and Interlinear Annotations, 1998-02-22
L2/98-070
Aliprand, Joan; Winkler, Arnold, 3.C.5. Support for implementing inline and interlinear annotations, Minutes of the joint UTC and L2 meeting from the meeting in Cupertino, February 25-27, 1998
L2/98-099
N1727
Freytag, Asmus, Support for Implementing Interlinear Annotations as used in East Asian Typography, 1998-03-18
L2/98-158
Aliprand, Joan; Winkler, Arnold, Inline and Interlinear Annotations, Draft Minutes – UTC #76 & NCITS Subgroup L2 #173 joint meeting, Tredyffrin, Pennsylvania, April 20-22, 1998, 1998-05-26
L2/98-286
N1703 (页面存档备份 ,存于互联网档案馆 )
Umamaheswaran, V. S.; Ksar, Mike, 8.14, Unconfirmed Meeting Minutes, WG 2 Meeting #34, Redmond, WA, USA; 1998-03-16--20, 1998-07-02
L2/98-270
Hiura, Hideki; Kobayashi, Tatsuo , Suggestion to the inline and interlinear annotation proposal, 1998-07-29
L2/98-281R (pdf , html (页面存档备份 ,存于互联网档案馆 ))
Aliprand, Joan, In-Line and Interlinear Annotation (III.C.1.c), Unconfirmed Minutes – UTC #77 & NCITS Subgroup L2 # 174 JOINT MEETING, Redmond, WA -- July 29-31, 1998, 1998-07-31
L2/98-363
N1861 (页面存档备份 ,存于互联网档案馆 )
Sato, T. K., Ruby markers, 1998-09-01
L2/98-372
N1884R2 (pdf , doc (页面存档备份 ,存于互联网档案馆 ))
Whistler, Ken; et al, Additional Characters for the UCS, 1998-09-22
L2/98-416
N1882.zip
Support for Implementing Interlinear Annotations, 1998-09-23
L2/98-329
N1920 (页面存档备份 ,存于互联网档案馆 )
Combined PDAM registration and consideration ballot on WD for ISO/IEC 10646-1/Amd. 30, AMENDMENT 30: Additional Latin and other characters, 1998-10-28
L2/98-421R
Suignard, Michel; Hiura, Hideki, Notes concerning the PDAM 30 interlinear annotation characters, 1998-12-04
L2/99-010
N1903 (pdf , html (页面存档备份 ,存于互联网档案馆 ), doc (页面存档备份 ,存于互联网档案馆 ))
Umamaheswaran, V. S., 8.2.15, Minutes of WG 2 meeting 35, London, U.K.; 1998-09-21--25, 1998-12-30
L2/98-419 (pdf , doc (页面存档备份 ,存于互联网档案馆 ))
Aliprand, Joan, Interlinear Annotation Characters, Approved Minutes -- UTC #78 & NCITS Subgroup L2 # 175 Joint Meeting, San Jose, CA -- December 1-4, 1998, 1999-02-05
UTC/1999-021
Duerst, Martin; Bosak, Jon , W3C XML CG statement on annotation characters, 1999-06-08
L2/99-176R
Moore, Lisa, W3C Liaison Statement on Annotation Characters, Minutes from the joint UTC/L2 meeting in Seattle, June 8-10, 1999, 1999-11-04
L2/01-301
Whistler, Ken, E. Indicated as "strongly discouraged" for plain text interchange, Analysis of Character Deprecation in the Unicode Standard, 2001-08-01
參考資料
文字
欧洲文字Ⅰ 現代文字與儀式文字 欧洲文字Ⅱ 古代文字與其它文字 中东文字Ⅰ 現代文字與儀式文字 中东文字Ⅱ 古代文字 楔形文字與象形文字 南亞和中亞文字Ⅰ 印度官方文字 南亞和中亞文字II 其它現代文字 南亞和中亞文字Ⅲ 古代文字 南亞和中亞文字Ⅳ 其它歷史文字 东南亚文字 印尼和大洋洲文字 东亚文字 非洲文字 美洲文字
符号
標記系統 标点符号 字母数字符号 技术符号 数字 数学符号 绘文字与象形 其它符號
其它