three-stranded; triple
Describes something consisting of three strands, layers, or connected parts. Often used in compound nouns like 三連休 (three-day weekend) or 三連符 (triplet note).
I bought a three-stranded pearl necklace.
今週末は三連休だ。
This weekend is a three-day weekend.
Compound of 三 (three) and 連 (link, connect, strand). The exact historical derivation is uncertain, but the word follows a common pattern for counting connected items.