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| Subject | English | Bulgarian |
| IT | backbone network | опорна мрежа |
| comp., MS | backbone router In Open Shortest Path First (OSPF), a router that is connected to the backbone area. This includes routers that are connected to more than one area (area border routers (ABRs)). However, backbone routers do not have to be ABRs. Routers that have all networks connected to the backbone are internal routers | опорен маршрутизатор (свързан към опорна мрежа) |
| law | form the backbone of | лежи в основата на (алешаBG) |
| agric. | spinal backbone | гръбначен |