Note that this journalistic device does not match the definitions given below or elsewhere.
More particularly I was hoping to stumble upon an explanation of why this device is punctuated the way it is, i.e. with no full stop (or period).
I haven't had much success, but here are some of the items located so far:
The FT on its own new layout (15 September 2014 issue): New look for Financial Times newspaper.
6 newspaper writing techniques for the web. Example:
Standfirsts are short (1 or 2 sentence) summaries of the complete text.Among the definitions offered by Elements of a newspaper:
Kicker: Kicker is the headline that is written on top of the main headline. It is set in a point size that is less than the point size used to set the main headline. In several newspapers the Kicker is called Shoulder.On taglines, including tagline punctuation: Tagline blues.
Strapline: Strapline is a headline written beneath the main headline. It is written in a point size that is smaller than the point size used to write the main headline, and is generally used to highlight a new point. It can also be used to amplify the main headline. In some newspapers, Strap-line is also referred to as Reverse Shoulder.
Infographic: An infographic is an art form where words are used with charts, illustrations, graphs or photographs to tell a news story.
30 Awesome Newspaper Layout Examples & Tips
30 Stylish Examples of Layouts in Magazine Design
include examples from various countries in various languages.