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In '''[[Unicode]]''', a '''block''' is defined as one contiguous range of [[code point]]s. Blocks are named uniquely and have no [[intersection (set theory)|overlap]]. They may be defined with the starting and ending code points. The block explicitly can include code points that are [[General Category|unassigned and non-characters]].<ref>[http://www.unicode.org/glossary/#B Unicode glossary]</ref> Code points not belonging to any of the named blocks, e.g. in the unassigned [[Plane (Unicode)|planes]] 3–13, have the value block="No_block".
Conversely, every assigned code point has a property "Block name", which names in which block the [[Character (computing)|character]] is. This is determined by the code point only, although a block name will have a descriptive nature: "Tibetan" or "Supplemental Arrows-A". All assigned code points have a single block name.
Subdivisions, such as "[[Chess symbols in Unicode|Chess symbols]]" in the block [[Miscellaneous symbols (Unicode block)|Miscellaneous symbols]], are not a "block". The subgroup name is an informative editorial addition only.
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