Not allowing prisoners to communicate with each other is referred to as what?

The correct term for not allowing prisoners to communicate with each other is isolation. Isolation refers to the act of separating individuals from one another to prevent interaction and communication. This practice can be employed for various reasons, including maintaining order, preventing conspiracies, or protecting inmates from each other.

While the concept of silence may imply a lack of communication, it does not specifically capture the broader aspects of confinement and separation that isolation entails. As such, isolation is the more precise term in the context of prisoners not being allowed to communicate.