The phrase "diamond formation" refers to a shape or arrangement where objects or people are positioned to look like a diamond - a geometric figure with four sides. Full definition
The controls are laid out in diamond formation on each ear, with tactile arrows next to each function that make them easy to find while wearing the headset. (tomsguide.com)
The played a very tight diamond formation which we failed to counter by utilizing the width of the pitch. (justarsenal.com)
These planets have internal temperatures just right for diamond formation. (discovermagazine.com)