Final answer:
A fence, door, or wall indicated by a sign are examples of Controlled Entry Points, which are used to manage and control access for security purposes.
Step-by-step explanation:
A fence, door, or wall indicated by a sign are examples of Controlled Entry Points. These are points of access that have been deliberately established to manage and control entry and exit, usually for security purposes. A fence can act as a physical barrier, while a door may be part of a structure like a building whose access is controlled. A wall with a sign can indicate the boundary of a secure area and is another form of controlled entry point. By controlling these entry points, it's possible to create a safe zone that allows for better monitoring of who enters and exits a space, contributing to the safety and security of the area.