A set is a card that defines a group of cards.  

Any given card belongs to multiple sets. For example, the card named Wiki on Wheels is a member of these three sets:

• *all (All Cards)
• Basic+*type (All Basic Cards)
• Wiki on Wheels+*self (Just "Wiki on Wheels")

Rules are created by connecting Settings to Sets with the following formula:

Set + Setting = Rule

Each Set card offers a convenient interface for viewing and editing related Rules.  For example:

*all    

...

There are currently eight kinds of sets.  From broadest to narrowest, they are:

1. All Cards: *all
2. All Plus Cards: *all plus — (learn about plus cards)
3. All Cards of Type X: |Type X|+*type — (learn about card types)
4. Star Cards: *star — (learn about star cards)
5. Cards ending in +(Star Card): *rstar
6. Cards ending in +(Name X): |Name X|+*right
7. (Type X) + (Name Y) Cards: |Type X|+|Name Y|+*type plus right
8. A Single Card: |Name X|+*self

 Any rule on narrower set (higher number) will override a broader one (lower number).

For example, suppose you want to have a special layout for a card named "World Map".  You can set the layout for that one card with the following Rule: "World Map+*self+*layout".  Note that this connects a Set of one card ("World Map+*self") to the Setting "*layout".  This rule would overrule any broader *layout rule, such as *all+*layout, because the single card set (#8 above) is narrower than the set of all cards (#1 above).