A character block is a grouping of related characters within the Unicode encoding space. RWUCharTraits provides a Block enum with values that identify the various blocks, such as the BasicLatinBlock, the GreekAndCopticBlock, the BengaliBlock, the ThaiBlock, the EthiopicBlock, the CherokeeBlock, and so on. The values in this enumeration correspond to the block names that appear in the Unicode Character Database, as described in Chapter 14, “Code Charts,” of the Unicode Standard.

The static method RWUCharTraits::getBlock() returns the value in the Block enumeration that identifies the character block containing the Unicode character with a given code point.