Gate
A boundary that is also a possible entry — what controls who comes in.
A gate in a dream is the dictionary's image of a boundary that can also be an entry. The state of the gate matters: open, closed, locked, guarded. The dream often appears around situations of access — who is being let in, who is being kept out, and whether you are the gatekeeper or the one asking entry.
Where you often see it. A gate standing open. A gate with a lock you do not have. The dream uses the gate for a boundary that is also a possible entry — what controls who comes in.
What it is not. A gate is not always exclusion. The dictionary reads it as conditional access.
Related in the dictionary. Read gate with fence, wall, door, and any scene of selective passage.