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Binary ordered compression for Unicode, also known as BOCU, is a data compression algorithm designed for the Unicode character set. It is commonly used in software applications for performing text encoding and decoding, as well as for compressing and decompressing data.

BOCU works by using a binary representation of the Unicode code points, where each code point is assigned a unique binary sequence. The sequences are then ordered based on their numerical values, with those that represent lower-code points coming first.

When compressing text using BOCU, the algorithm applies a series of encoding steps to the text to convert it into a compact binary format. This compressed data can be transmitted or stored in this form until it is needed for use. When the compressed data is decompressed, the algorithm reverses the encoding process to restore the original text.

BOCU has several advantages over other compression algorithms, including its ability to handle a wide range of text formats and its efficient use of memory. It is also designed to work well with both ASCII and Unicode text, and it is widely supported by a variety of software applications and programming languages.