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Arabic Presentation Forms-B

Unicode character block

Unicode character block

FieldValue
rangestartFE70
rangeendFEFF
script1Arabic (140 char.)
script2Common (1 char.)
symbolscontextual and isolate forms of Arabic letters and points
1_0_0140
3_21
note
The characters in this block were re-ordered in Unicode 1.0.1, in the process of merging with ISO/IEC 10646.

The characters in this block were re-ordered in Unicode 1.0.1, in the process of merging with ISO/IEC 10646. Arabic Presentation Forms-B is a Unicode block encoding spacing forms of Arabic diacritics, and contextual letter forms. The special codepoint ZWNBSP (zero width no-break space) is also here, which is only meant for a byte order mark (that may precede text, Arabic or not, or be absent) The byte-order mark is very useful in detecting endianness in UTF-16, because when it is at the start of UTF-16 data and the interpreter reads the first character as the noncharacter U+FFFE, the file is clearly interpreted with the wrong endianness. The block name in Unicode 1.0 was Basic Glyphs for Arabic Language; its characters were re-ordered in the process of merging with ISO 10646 in Unicode 1.0.1 and 1.1.

The presentation forms are present only for compatibility with older standards, and are not currently needed for coding text.

Block

History

The following Unicode-related documents record the purpose and process of defining specific characters in the Arabic Presentation Forms-B block:

VersionCountUTC IDL2 IDWG2 IDDocument
1.0.0U+FE70..FE72, FE74, FE76..FE7F14
U+FE80..FEFC125(to be determined)
U+FEFF1
3.2U+FE731
[N2322](https://www.unicode.org/wg2/docs/n2322.pdf)
[doc](https://www.unicode.org/wg2/docs/n2353.doc))

References

Notes

References

  1. "Unicode character database". The Unicode Standard.
  2. "Enumerated Versions of The Unicode Standard". The Unicode Standard.
  3. "The Unicode Standard, Version 12.0.0". The Unicode Consortium.
  4. "3.8: Block-by-Block Charts". [[Unicode Consortium]].
  5. (1992-11-03). "Unicode 1.0.1 Addendum". The Unicode Standard.
  6. The Unicode Consortium. [https://www.unicode.org/versions/Unicode6.0.0/ The Unicode Standard, Version 6.0.0], (Mountain View, CA: The Unicode Consortium, 2011. {{ISBN. 978-1-936213-01-6), [https://www.unicode.org/versions/Unicode6.0.0/ch08.pdf Chapter 8]
  7. Proposed code points and characters names may differ from final code points and names
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This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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