Keystone
Posted: Fri Mar 03, 2023 5:01 pm
And not the Kop version. A simple word, so maybe just key would be a better suggestion, but I'm going for the linchpin idea here. Which is itself another good word, perhaps.
A keystone is the symbol of Pennsylvania, the "Keystone State".
A slight variant also forms the shape of a Heinz ketchup label.