The term 'Christmas Tree Topper' refers to the decorative item placed at the top of a Christmas tree. Commonly, this item is either a HALO (4 letters), STAR (4 letters), ANGEL (5 letters), or FIR (3 letters). These items are usually made of plastic, metal, or fabric and come in a variety of shapes and sizes. They are often used to add a festive touch to the tree and can be used to represent the religious significance of the holiday.