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@edric
I think its an Alsop beam tried out on triathlon bikes in the 90s.Some bicycles have no seat tube at all, and attach the saddle to a cantilevered beam, which points back from a point just behind the head tube. This beam may be made flexible, to provide a very good suspension system with no moving parts. Although this system goes back at least to the 1940s, when there was an Italian bike with a spring-steel beam, it didn't really catch on until the 1990's when the Softride (originally called "Alsop") beam was introduced. This composite beam is sort of like a mini-diving board, and provides excellent rider comfort.