What is the definition of "not readily accessible to persons unless special means for access are used"?

The phrase "not readily accessible to persons unless special means for access are used" describes a situation in which accessibility is limited, requiring additional effort or specific methods to reach that particular area or item. The term "isolated" accurately encapsulates this idea, as it suggests that something is separated from general access, possibly being situated in a location that isn't naturally approachable or that prevents casual entry.

In this context, "isolated" signifies a space or object that operates outside of normal access, which can pertain to physical locations or even conceptual spaces in various fields. The idea of isolation inherently implies a need for deliberate effort or mechanisms to connect with or access the isolated area.

On the other hand, the other terms imply different concepts. A "barrier" typically refers to something that obstructs access or movement, but it does not necessarily convey the broader sense of difficulty. "Restricted" indicates that access is limited but could still suggest a level of availability under certain conditions. "Encapsulated" suggests being enclosed or contained within a boundary, but it lacks the element of access requiring special means, as it may not inherently imply difficulty in reaching it.