The term 'Diamond Topper' refers to three items of headwear: a CAP, a tarp, and a baseball CAP. A CAP is a short, brimless hat with a flat crown, typically made of fabric or leather. A tarp is a large, waterproof sheet of material used to cover objects or surfaces. A baseball CAP is a type of soft CAP with a long, curved brim and a panel at the back that can be adjusted to fit the wearer's head. All three items are commonly worn as a fashion accessory or to protect the head from the elements.