Petit-serif
Encyclopedia
Petit-serifs are small serif
Serif
In typography, serifs are semi-structural details on the ends of some of the strokes that make up letters and symbols. A typeface with serifs is called a serif typeface . A typeface without serifs is called sans serif or sans-serif, from the French sans, meaning “without”...

s, which are attached to regular sans-serif
Sans-serif
In typography, a sans-serif, sans serif or san serif typeface is one that does not have the small projecting features called "serifs" at the end of strokes. The term comes from the French word sans, meaning "without"....

 fonts.

An example of this is Johnston
Johnston (typeface)
Johnston is a humanist sans-serif typeface designed by and named after Edward Johnston. It is well known for its use by Transport for London....

. Petit-serifs were added to this font, but Frank Pick
Frank Pick
Frank Pick LLB Hon. RIBA was a British transport administrator. After qualifying as a solicitor in 1902, he worked at the North Eastern Railway, before moving to the Underground Electric Railways Company of London in 1906...

chose to stay with the original design (later modified).
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