Yeah, I guess it would be considered a kind of flashing. It's weird, there's not a consistent rivet pattern attaching it, nor any visible sealant around the edges.
Virginia (SoCal Silver Sister)
"The Towster" 1969 Globetrotter 21' (Silver)
"The Yeti" 2001 Chevy Silverado 2500HD 8.1 Allison Crew Cab (White)
"The Boat" Old Town Canoe Discovery 174 (Green)