J bead is a term sometimes used to describe a stop bead.

Jointing describes where one bead is joined to another to form either an angle or to create a continuous run of beading from more than one bead. For example when a corner bead sits next to a bellcast bead at the bottom of an external wall. It is important to note that in circumstances where jointing is required, the join must be sealed using something like PVC Pipe Weld to avoid potential water ingress.