cufflink

Cufflinks are associated with formal attire and a sense of prestige or traditional elegance. They are used specifically with French cuffs, which are designed to be folded back and fastened, rather than the standard buttoned cuffs found on casual shirts. Because they are always used in pairs to secure both sleeves, the word is frequently encountered in the plural. While technically a countable noun, it is almost exclusively discussed in the context of a set.