An arrow for indicating that one component is inserted in another.
The InsertionArrow occurs in a number of contexts, all related to models of physical objects. For example, a population of synapses is connected to a cell body by an insertion arrow. It indicates that the synapses belong in the membrane of the target cell.
Another use of the insertion arrow is in virtual environments where objects are attached to particular places in an environment (insertion sites) or where an animat is attached to a trajectory point to indicate where it starts.