Basic Multilingual Plane | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-02

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Plane_(Unicode)


00:02:40 1 Overview
00:02:49 2 Basic Multilingual Plane
00:04:22 3 Supplementary Multilingual Plane
00:05:22 4 Supplementary Ideographic Plane
00:06:37 5 Unassigned planes
00:07:42 6 Supplementary Special-purpose Plane
00:08:32 7 Private Use Area planes



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Speaking Rate: 0.9062852355877579
Voice name: en-US-Wavenet-C


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SUMMARY
=======
In the Unicode standard, a plane is a continuous group of 65,536 (216) code points. There are 17 planes, identified by the numbers 0 to 16, which corresponds with the possible values 00–1016 of the first two positions in six position hexadecimal format (U+hhhhhh). Plane 0 is the Basic Multilingual Plane (BMP), which contains most commonly-used characters. The higher planes 1 through 16 are called "supplementary planes". The very last code point in Unicode is the last code point in plane 16, U+10FFFF. As of Unicode version 12.1, six of the planes have assigned code points (characters), and four are named.
The limit of 17 planes is due to UTF-16, which can encode 220 code points (16 planes) as pairs of words, plus the BMP as a single word.. UTF-8 was designed with a much larger limit of 231 (2,147,483,648) code points (32,768 planes), and can encode 221 (2,097,152) code points (32 planes) even under the current limit of 4 bytes.The 17 planes can accommodate 1,114,112 code points.  Of these, 2,048 are surrogates (used to make the pairs in UTF-16), 66 are non-characters, and 137,468 are reserved for private use, leaving 974,530 for public assignment.
Planes are further subdivided into Unicode blocks, which, unlike planes, do not have a fixed size. The 300 blocks defined in Unicode 12.1 cover 25% of the possible code point space, and range in size from a minimum of 16 code points (fourteen blocks) to a maximum of 65,536 code points (Supplementary Private Use Area-A and -B, which constitute the entirety of planes 15 and 16). For future usage, ranges of characters have been tentatively mapped out for most known current and ancient writing systems.