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A Unicode block , or, simply, a block, is an organisational unit any of the subsets of the Unicode code spacethat are listed in the file {{code|Blocks.txt}}<ref name="Blocks">The Unicode Consortium, ''Blocks.txt'', ftp://www.unicode.org/Public/UNIDATA/Blocks.txt, Retrieved 2017-11-03.</ref> of the Unicode Character Database. The Unicode code space is the set of all code points, that is, the set of all integers from 0 to the integer whose hexadecimal representation is 10FFF. The official list of the blocks is available [ftp://www.unicode.org/Public/UNIDATA/Blocks.txt at the Unicode Web site].

The main properties of blocks are described in the Unicode Standard<ref name="Unicode"/> (Section 3.4, paragraph D10b). Every block is an interval of code points. Different , and distinct blocks are disjoint from each other, and every code point belongs to at least one block. ThusIn particular, the blocks form a partition of a subset of the set of all Unicode code points. The number of code points in a block varies. Some have just 16 code points, and some others have thousands of code pointsspace.

A code block starts at a code point that is a multiple of 16. The number of code points in each block is also a multiple of 16. Thus, the hexadecimal representation of the first code point in a block is of the form ''pqrs''0, and that of the last code point in it is of the form ''tuvw''F, where ''p'', ''q'', ''r'', ''s'', ''t'', ''u'', ''v'', and ''w'', are hexadecimal digits.

The Unicode standard Standard gives every block a unique name that describes the common semantic nature of its code points. These names are case insensitive, and the hyphens, spaces, and underscores, in them are insignificant. For example, one can refer to the block whose Unicode name is {{code|Myanmar Extended-A}} as {{code|myanmarextendeda}}, {{code|MyanmarExtendedA}}, or {{code|myanmar_extended_a}}. ConTeXt chooses the first of these alternative styles for the names of blocks, as described below.

== ConTeXt names The number of Unicode blocks ==code points in a block varies. Some, such as the block named {{code|Syriac Supplement}}, have just 16 code points, and some others, such as the block named {{code|CJK Unified Ideographs Extension B}} with 42720 elements, have thousands of code points.

ConTeXt has its own names Every assigned code point belongs to some block, but there are blocks which contain unassigned code points too; for all example, the Unicode blocks. These names are defined in the source file block named {{srccode|char-ini.luaTelugu}}contains the unassigned code point 0C50. Most of them On the other hand, there are obtained by converting some code points, necessarily unassigned, which do not belong to any block; the code point 0870 is one such. Thus, the Unicode name set of all assigned code points is a proper subset of the block to union of all the lower caseblocks, and removing the hyphens and spaces in union of all the blocks is a proper subset of the nameUnicode code space.

== The list ConTeXt names of Unicode blocks ==

See ConTeXt has its own names for all the Unicode blocks. Most of them are obtained by converting the Unicode name of the block to the lower case, and removing the hyphens and spaces in the name. The article entitled [[List of Unicode blocks]] for contains a table of Unicode blocks, their ConTeXt names, and links to more information about them.

Here is a Look at this bestiary of mathematical script letters: