kites - thank you, that's the word I was looking for. Well one of the words I was looking for.
And thank you Irish, your answer does make sense. Which kind of changes my question to "Does anybody know what are the angles on the kites and triangles in the DJ quilt (without me going to measure them)? I will go and get the book out or the CD, or even a bit of online research, but atm I'm watching the Wimbledon final.