When setting up Access Zones (JT Live module enabled) it’s possible to set a zone as virtual, to accommodate zoning requirements that lack physical counterparts.
For example let’s assume a room has two doors, each with an access reader mounted, and single reader in the middle of the room. In order to create a requirement of clocking on the single reader for T&A, it could be placed in a virtual zone. Physically it can only be grouped with one or both of the door readers as they all share the same physical area, but virtually it can be separated as its own zone.