, a block
is defined as one contiguous range of code points
. Blocks are named uniquely and have no overlap
. They have a starting code point of the form hhh
0 and an ending code point of the form hhh
F. A block explicitly can include code points that are unassigned and non-characters
Code points not belonging to any of the named blocks, e.g. in the unassigned planes
3–13, have the value block="No_block".
Conversely, every assigned code point has a property "Block name", which identifies the unique block containing the character. This is determined by the code point only, although a block name will have a descriptive nature: "Tibetan" or "Supplemental Arrows-A".
Subdivisions, such as "Chess symbols" in the block Miscellaneous symbols, are not a "block". The subgroup name is an informative editorial addition only.
The number of code points in a Unicode block is a multiple of 16. Unicode blocks range in size from the minimum of 16 to a maximum of 65,536 code points.
Unicode 11.0 defines 291 blocks:
This page was last edited on 6 June 2018, at 23:40 (UTC)
under CC BY-SA license.