| BT | Broader Term |
|---|---|
| NT | Narrower Term
Terms in hierarchy must have an is a relationship NT is a type of BT NT is a part of BT NT is an instance of BT |
| RT | Related Term |
| UF | Use For (lead-in terms). |
| UF+ | Use With (precoordinated lead-in terms). |
| SN | Scope Note |