That's how the colour of this yarn is called. I think it's a well chosen name, the yarn really has the colour of a herring. Must be a great job, to think out names for yarn colours! The yarn is Rowans's Scottish Tweed Chunky and I'm going to knit Blackberry with it, a Knitty pattern. But before I start knitting I first have to find out which needle size is best. The Blackberry pattern has been knitted with Rowan Chunky Print, which is thicker than the yarn I bought.