What are the names of these connectors in a schematic: an 8 pin connector and one labeled BU-BNC?
Those supply symbols with arrows usually foster a so called "supply" pin in EAGLE. If you connect such a supply pin to any other pins in a schematic it enforces membership of all connected wires and pins in a net with the same name as the supply symbol. Hence when switching to the layout all corresponding components in junction with supply pins of the same name in the schematic will be connected with yellow airwires. 

There is no physical representation of the supply pin in the layout. It is only a logical naming automatism. Beware when connecting more than one different supply pin to a net, then this mechanism will fail and you will get warnings when executing the ERC.

Beware also, that you should check the library of the supply pin, if this is really a supply pin (check the pin function within the library) otherwis it won't work as described.