When individuals or objects are subjected to certain limitations for safety reasons, they are said to be under security restrictions. However, there are various synonyms that can be used to refer to this state. For instance, the phrase "under surveillance" indicates close monitoring, while "in confinement" suggests that an individual or item is restricted to a confined space. "Under lockdown" is used to refer to a situation where no one can enter or exit a particular area, while "restricted access" implies that only authorized individuals can access an area. Other synonyms for under security restrictions include constrained, regulated, and supervised. Ultimately, these different terms can be used to describe situations where safety is the top priority.