Column rule

a thin strip of brass separating columns of type in the form, and making a line between them in printing.

See also: Column

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
"I must confess I threw away most of the news articles, but did Keep one or two, including ones when Queen Victoria died and the newspapers turned the column rules round to give the spread some gravitas.
Among a number of changes, readers will notice the magazine's dimensions have altered (it is slightly wider); there is greater use of white space, with the removal of column rules and page outlines; headlines are larger, often running across two pages within a coloured border, and there are new fonts and a new type-size.
One such proposal was to eliminate column rules and add more white space, a proposal resisted by the focus group.
Column rules, jim dashes, second and third decks, overlines on pictures rather than catchlines below the photo, paragraphs far longer than the ideal of a dozen or so lines -- they're rearin' their ugly heads all over the landscape.
Watson does, however, like air, or white space, between headlines and clear demarcations between design elements, possibly with column rules, so readers don't have to guess which photo goes with which story.
"All we had to do is reduce space around column rules and slightly reduce the characters."