In art, architecture, and traditional Christian symbolism, the quatrefoil
is a type of decorative framework consisting of a symmetrical shape
which forms the overall outline of four partially overlapping circles of
the same diameter. The word quatrefoil means "four leaves", from Latin quattuor, four, plus folium, a leaf.) and applies to general four-lobed shapes in various contexts."from wiki
I was actually ahead of the craze when I purchased pillows for my studio a few years back and in my favorite color no less.