I'm not Danish, but on their behalf I'd like to note that these are called Tuborgs after the beer company. Apparently their delivery trucks had a profile that looked like the braces.
You're on to something: in my math classes they would often be referred too as a "væltet Turborg". Which means a "fallen down Tuborg" ie. it's turned on the side. The profile can be seen on the roof of this truck: http://www.mc-barskk.dk/images/Tuborg_Julebryg.jpg