The term 'round-pin' is a combination of two words, 'HOB' and 'DOWEL'. HOB is a three-letter word that refers to a tool used in metalworking to cut or shape metal. A DOWEL is a five-letter word that refers to a cylindrical rod made of wood, metal, or plastic that is used to join two pieces of material together. Together, the two words form the term 'round-pin', which is a type of fastener used to join two pieces of material together.