Technical term in grammar and logic for a word or particle that links subject and predicate, such as だ, です, or である in Japanese.
日本語の「だ」や「です」は繋辞の一種です。
Japanese 'da' and 'desu' are types of copula.
論理学では、繋辞は主語と述語を結
In logic, the copula serves to link the subject and predicate.
Compound of 繋 (connect) and 辞 (word/expression), literally 'connecting word'. The exact historical derivation is uncertain, but the term is a calque from Western grammatical terminology.