This character is a Other Letter and is mainly used in the Han script. La base de datos de Unihan lo define como four. Su pronunciación en Pīnyīn es sì. The codepoint has the numeric value 4.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+56DB offers a line break opportunity at its position, except in some numeric contexts. The glyph can be confused with one other glyph.
El Wikipedia tiene la siguiente información acerca de este punto de código:
Chinese numerals are words and characters used to denote numbers in written Chinese.
Today, speakers of Chinese languages use three written numeral systems: the system of Arabic numerals used worldwide, and two indigenous systems. The more familiar indigenous system is based on Chinese characters that correspond to numerals in the spoken language. These may be shared with other languages of the Chinese cultural sphere such as Korean, Japanese, and Vietnamese. Most people and institutions in China primarily use the Arabic or mixed Arabic-Chinese systems for convenience, with traditional Chinese numerals used in finance, mainly for writing amounts on cheques, banknotes, some ceremonial occasions, some boxes, and on commercials.
The other indigenous system consists of the Suzhou numerals, or huama, a positional system, the only surviving form of the rod numerals. These were once used by Chinese mathematicians, and later by merchants in Chinese markets, such as those in Hong Kong until the 1990s, but were gradually supplanted by Arabic numerals.