The phrase "positive terminal" refers to the side of a battery or electrical device where the positive charge comes out. It is the spot where the electricity flows from the device. Full definition
Battery positive terminal (+) should be connected to the other connector of the switch. (mechanics.stackexchange.com)
Test that by hooking up a wire between the battery positive and the fan motor positive terminal, which should make the fan spin. (mechanics.stackexchange.com)
Thus, you can think of the two positive terminals as being one connection point and the two negative terminals as being one connection point. (mechanics.stackexchange.com)