UDC, or Universal Decimal Classification, is a system for organizing and classifying library materials that was developed in the late 19th century by Paul Otlet and Henri La Fontaine. It is intended to be used on a global scale, and as such, it has been translated into a number of different languages.
According to the UDC Consortium, the organization that maintains and develops the UDC system, the UDC has been translated into more than 40 languages, including English, French, Spanish, Russian, Chinese, and Arabic.
UDC is designed to be applicable to a wide range of materials in a variety of languages, and the translations of the system into different languages reflect this international scope. The UDC system is widely used in libraries around the world, and the availability of translations in multiple languages helps to make it accessible to a wider range of users.