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Join Object 
Overview: Ends parallel execution paths created by a fork object.
Allowed inputs: 2
Allowed outputs: 1
Description:
The join object is used to end and join parallel execution paths. When a diagram of a workflow instance is started, there is a single execution path (started by the Start block). If the execution reaches a fork block, the flow is split in several parallel paths (depending on the number of outputs in the fork) the execute simultaneously.
Line Joiner 
Overview: Ends parallel execution paths created by a fork object.
Allowed inputs: many
Allowed outputs: 1
Description:
Allows many outputs to be combined into a single path, so that parallel outputs can merge into one diagram object's input.
Note:
At the end, all execution paths must finish at the same join object, otherwise the diagram is incorrect. Once all parallel execution paths finish, the main execution path starts again, from the join object.