Which Chain

I wonder if anyone could help.I just got my bike back from a good friend, to whom I had lent it for
a weekend in belgium (he is new to the sport, and is saving up for a bike). Unfortunatley the chain
snapped, so he took it to a LBS and they put a new one on, now my pal, tom, didnt have a clue what
the chap was on about, as toms french is poor to say the least. The chain seems pretty decent, but I
havent got a clue what it is !! There is a marking stamped on the links (blqck qnd silver), and it
appears to be a rather fancy letter U. Can anyone tell me what chain it could be ???

thanks

Max