So what's the real origin? It turns out the blue-and-white logo was used in a 1929 ad that placed roundels in the rotating propellers of an airplane. It's easy to see where the confusion came from ...

From 1918 to 1920, the design changed as it became the official American insignia during World War I. Different from the previous emblem, this roundel did not feature a star, but rather three circles.

The roundel was first developed for London Underground a century ago. It is still used by Transport for London today.The roundel is one of the most recognised and imitated logos in the world.

Weavers in east London have celebrated a newly-named stretch of the London Overground by producing a roundel made out of fabric. The soon-to-be Weaver Line, part of the London Overground ...

A hand-woven roundel has been unveiled at a Hackney railway station to mark one of the London Overground’s new line names. The artwork went up at Hackney Downs station, which lies on the newly ...