Dowel
From DT Online
The term 'Dowel' most commonly refers to circular rods of timber. Dowel rods can be cut into short lengths and used to reinforce Butt Joints.
When used to make a Dowel Joint in this way, it is important to create a 'flat' along the length, or make a saw cut, to allow the excess glue to escape when the joint is brought together under pressure. Commercially available pre-cut Dowels are ribbed along their length for the same purpose.
Short lengths of Dowel can also be made by driving pieces of timber through a Dowel Plate.