Pins are short cylindrical metal, plastic, or wood rods. These pins align and join two components in various engineering applications, such as automobile and furniture manufacturing. Dowel pins provide an effective joining solution because they create a tight fit due to their smooth surface and internal tapered ends that allow for secure insertion into pre-drilled holes.  
Dowel pins have various uses in different applications, including woodworking, metalworking, automotive, aerospace, and electronics. In woodworking, dowel pins are used to align and hold together jointed wood parts, while in metalworking, they help align and secure metal parts. Dowel pins are vital in fixturing, assembly, and checking fixtures in automotive and aerospace applications. Additionally, they are used in packaging, furniture, toys, and electronics, among other fields.  

In the norms, the most common pins are;
DIN6325
ISO8734A
DIN7
ISO2338