noun
A short article or item used to fill empty space in a newspaper or magazine layout.
編集者はページの隙間を埋めるために六号記事を入れた。
The editor inserted a filler to fill the gap on the page.
六号 (number six) + 記事 (article). The origin of the term is uncertain; it may refer to a standard size or category of filler content in publishing.