I heard “key” and “keystone” a couple of times. We all talked about it back in the day... perhaps PA is the keystone, or with Q’s double meanings, it is also a marker of some kind?
PA is The Keystone State. It is (was) our state motto until history started being erased. During the Revolutionary War, Pennsylvania was the keystone —if PA had fallen, the unity of the colonies by geography (and sentiment) would have been lost and the colonies would have fallen.