noun
empty link set
Technical term in computing, referring to a set of links that contains no elements.
空連結集合は、リンクが一つも含まれていない集合です。
An empty link set is a set that contains no links.
Compound of 空 (empty), 連結 (link, connection), and 集合 (set). The exact derivation is uncertain; it is a technical term likely coined in computing contexts.