One of the main features of phospholipids is it's bi-layer organization, upon which the rest of the membrane is built. The structures in the phospholipids are the building blocks for the parts of the membrane that this type of lipid helps to create. They have a very distinct pattern because the fatty acid chains in the dual layers both point towards the membrane making it a key indicator of what type of lipid it is.
Another feature of this type of lipid is that the area referred to as the head of the lipid is attracted to water, while the opposite side is repelled by water. The basic structure of phospholipids, which is built onto to create various types of lipids, is a head of glycerol and a tail made up of fatty acids.