• Indexing languages

• Thesaurus compilation

• Reference materials
• Subject headings
• Terminological control
• Terminology

• Descriptors
• Monolingual thesauri
• Multilingual thesauri

• A controlled and dynamic documentary language containing semantically and generically related terms, which comprehensively covers a specific domain of knowledge.

• Information and communication > Information sciences

http://vocabularies.unesco.org/thesaurus/concept12263