Narrow openings are small openings that are usually found in walls, doors, or other objects. The term can be used to describe three different types of openings: SLITS, CRANNIES, and slots. SLITS are thin, long openings that are usually found in walls or other objects. CRANNIES are small, narrow openings that are often found in rocks or other natural objects. Slots are thin, elongated openings that are usually found in doors or other objects. All three of these terms refer to narrow openings that are typically found in everyday objects.