The term 'large single-edged knives' can refer to two different types of knives: Bowies and Bolos. Bowies are large, fixed-blade knives that were popularized by American frontiersman Jim Bowie in the early 19th century. They typically have a curved blade and a clip point. Bolos are large, single-edged knives that originated in the Philippines. They are usually used for agricultural purposes, such as cutting grass or harvesting crops.