Final answer:
Roger Crouch's chapter designation is a unique identifier for the Pi Kappa Phi fraternity chapter he belonged to at Old Dominion University.
Step-by-step explanation:
The chapter designation of Roger Crouch as a Pi Kappa Phi fraternity member at Old Dominion University refers to the specific chapter of the fraternity that he was a part of during his time at the university. Each chapter of a fraternity or sorority on different campuses has a unique name or designation, which is usually a mix of Greek letters. This identification helps distinguish between the various chapters of the same fraternity across different institutions.