Mapping of Unicode character planes
- Mapping of Unicode character planes
The Unicode characters can be categorized in many different ways, Unicode code points can be logically divided into 17 "planes", each with 65,536 (= 216) code points, although currently only a few planes are used:
*Plane 0 (0000–FFFF): Basic Multilingual Plane (BMP). This is the plane containing most of the character assignments so far. A primary objective for the BMP is to support the unification of prior character sets as well as characters for writing systems in current use.
*Plane 1 (10000–1FFFF): Supplementary Multilingual Plane (SMP).
*Plane 2 (20000–2FFFF): Supplementary Ideographic Plane (SIP)
*Planes 3 to 13 (30000–DFFFF) are unassigned
*Plane 14 (E0000–EFFFF): Supplementary Special-purpose Plane (SSP)
*Plane 15 (F0000–FFFFF) reserved for the Private Use Area (PUA)
*Plane 16 (100000–10FFFF), reserved for the Private Use Area (PUA)
Currently, about ten percent of the potential space is used. Furthermore, ranges of characters have been tentatively blocked out for every current and ancient writing system (script) the Unicode consortium has been able to identify: (see [http://www.unicode.org/roadmaps/] ). While Unicode may eventually need to use another of the spare 11 planes for ideographic characters, other planes remain, if previously unknown scripts with tens of thousands of characters are discovered. This 20 bit limit is therefore unlikely to be reached in the near future.
Basic Multilingual Plane
The first plane (plane 0), the "Basic Multilingual Plane" (BMP), is where most characters have been assigned so far. The BMP contains characters for almost all modern languages, and a large number of special characters. Most of the allocated code points in the BMP are used to encode Chinese, Japanese, and Korean (CJK) characters.
As of Unicode 5.1, The BMP includes the following scripts:
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