The Interrupt Flow is a connection used to define the two UML concepts of connectors for Exception Handler and Interruptible Activity Region. An Interrupt Flow is a type of activity edge. It is typically used in an Activity diagram, modeling an active transition.
OMG UML Specification:
The OMG Unified Modeling Language specification, (v2.5.1, p.375) states:
An ActivityEdge is a directed connection between two ActivityNodes along which tokens may flow, from the source ActivityNode to the target ActivityNode..