Most Italian salume panini name one cured meat and stop. This one does the opposite: it is a board, not a single voice. Norcia, the Umbrian hill town whose name became the word for the trade itself, norcineria, sends out a spread of cured pork at once, so the sandwich is a small selection rather than a single slice. A coil of the local prosciutto di Norcia, a few rounds of a peppery salame, a smear of something spreadable, perhaps a slice of capocollo: the defining idea is that each cut answers a different register, lean against fatty, mild against sharp, sliced against spreadable, and the sandwich is the contrast between them.
The craft is keeping the board legible inside the bread. Each meat is cut to its own logic: the prosciutto paper-thin and folded loose so air gets through it, the firm salame cut thicker to hold its bite, anything spreadable kept to a thin layer so it binds rather than smothers. The order on the bread matters because the meats are not interchangeable; the leaner cuts go where they will not be crushed, the fattier ones where their fat can gloss the crumb. The bread is a plain crusted Umbrian loaf or a sturdy roll, chosen with enough structure to carry several meats without collapsing and enough restraint not to argue with any of them. Butter or oil appears rarely, only where a very lean slice needs bridging to the crust. It is built to be eaten soon, while the prosciutto is still supple and the fat has not gone waxy in the bread.
The variations are mostly about which cuts make the board on a given day rather than departures from the idea. There is the version weighted to prosciutto, the one built around the wild-boar salame the area is also known for, and the single-salume panini, capocollo on its own among them, that pull one cut out of the board entirely. Those single-meat builds each deserve their own articles rather than being crowded in here.