What represents an Item Flow in an IBD?

An Item Flow in an Internal Block Diagram (IBD) is represented by a filled-in arrowhead placed on a connector. This visual notation effectively conveys the direction and nature of the flow of items (such as data or control signals) between blocks in a system. By using a filled-in arrowhead, it clearly indicates that there is a transfer or movement of items from one block to another, distinguishing it from mere connections that do not specify directionality or content. This is a crucial feature in modeling systems, as it helps in visualizing the interactions and dependencies between components and their behaviors within the system under examination.