Content deleted Content added
m Reverted edits by 188.63.164.206 (talk) to last revision by Tamfang: nonconstructive edits |
|||
| (9 intermediate revisions by 8 users not shown) | |||
Line 1:
{{Short description|Named range of Unicode code points}}
{{for|the specific group of square characters in the Unicode typeset|Block Elements}}
A '''Unicode block''' is one of several contiguous ranges of numeric character codes ([[code point]]s) of the [[Unicode]] character set that are defined by the [[Unicode Consortium]] for administrative and documentation purposes. Typically, proposals such as the addition of new glyphs are discussed and evaluated by considering the relevant block or blocks as a whole.
Line 5 ⟶ 6:
== Design and implementation ==
Unicode blocks are identified by unique names, which use only ASCII characters and are usually descriptive of the nature of the symbols, in [[English language|English]]; such as "Tibetan" or "Supplemental Arrows-A". (When comparing block names, one is supposed to equate uppercase with lowercase letters, and ignore any whitespace, hyphens, and underbars; so the last name is equivalent to "
Blocks are [[intersection (set theory)|pairwise disjoint]]; that is, they do not overlap. The starting code point and the size (number of code points) of each block are always multiples of 16; therefore, in the [[hexadecimal
Every assigned code point has a glyph property called "Block", whose value is a character string naming the unique block that owns that point.<ref>{{Cite web |title=Glossary |url=https://www.unicode.org/glossary/#B |access-date=2022-08-07 |website=www.unicode.org}}</ref> However, a block may also contain unassigned code points, usually reserved for future additions of characters that "logically" should belong to that block. Code points not belonging to any of the named blocks, e.g. in the unassigned [[Plane (Unicode)|planes]] 4–13, have the value block="No_Block".<ref name=uniblocks/>
Line 21 ⟶ 22:
== List of blocks ==
Unicode {{Unicode version|version=
* 164 in plane 0, the Basic Multilingual Plane (in table below: {{slink||BMP}})
*
* 7 in plane 2, the Supplementary Ideographic Plane ({{slink||SIP}})
* 2 in plane 3, the Tertiary Ideographic Plane ({{slink||TIP}})
Line 31 ⟶ 32:
{{Unicode blocks|state=uncollapsed}}
== {{anchor|Deleted blocks}}Moved blocks ==
The Unicode Stability Policy requires that a character, once assigned, may not be moved or removed, although it may be deprecated. This applies to Unicode 2.0 and all subsequent versions.
| |||