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A '''Unicode block''' is an organisational unit of the Unicode code space. The Unicode code space is the set of all integers from 0 to 0x10FFF. The official list of the blocks is available [ftp://www.unicode.org/Public/UNIDATA/Blocks.txt at the Unicode Web site].

Every block is an interval of code points. Different blocks are disjoint from each other. In particular, the blocks form a partition 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 points.