traits

These are special sets for adding functionality to a card based on it having a particular plus card.  For example when we refactor user account handling from it's current implementation as a ActiveRecord model to being "in the cards", we would use this traits concept.  So a User card 'U' will have one of more associated accounts in traits attached to U.  The simple form woud be U+*account, U would be said to have an account trait.

The reason this isn't simply a set is because it has to change what you see for the U card, it gives you Options that include account settings (if you have the permissions, maybe).