Category generally span many blocks, and do not have to be consecutive, not even within each block. Each code point also has a script property, specifying which writing system it is intended for, or whether it is intended for multiple writing systems. This, also, is independent of block. In descriptions of the Unicode system, a block may be subdivided into more specific subgroups, such as the "Chess symbols" in the Miscellaneous Symbols block (not to be confused with the separate Chess Symbols block). Those subgroups are not "blocks" in the technical sense used by the Unicode consortium, and are named only for the convenience of users. List of blocks Unicode 15.0 defines 327 blocks: 164 in plane 0, the Basic Multilingual Plane (in table below: ) 151 in plane 1, the Supplementary Multilingual Plane () 6 in plane 2, the Supplementary Ideographic Plane () 2 in plane 3, the Tertiary Ideographic Plane () 2 in plane 14 (E in hexadecimal), the Supplementary Special-purpose Plane () One each in the planes 15 (Fhex) and 16 (10hex), called Supplementary Private Use Area-A and -B () Deleted blocks The Unicode Stability Policy requires that a character, once assigned, may not be moved or removed, although it may be deprecated. This applies to Unicode 2.0 and all subsequent versions. Prior to this, the following former blocks were removed: References External links of the Unicode Consortium