The mini toolbar provides you with exactly the object symbols that can be linked to the selected object using a connection.
When you place an object symbol from the mini toolbar in the model window a connection between the selected object and the new object symbol is created at the same time. In addition, you can use the mini toolbar to create connections to existing objects.
The mini toolbar is configured for each object type. When you click an object, the mini toolbar provides the object symbols you selected for the underlying object type.