What battery terminal has two wires the positive or negative?

Multiple Wires at Automotive Battery Terminal Clamps

I have seen two, or occasionally more, wires attached to either battery terminal.

It depends on the vehicle, and the electrical devices that may demand the need for a direct connection to the battery. For example, a super large sound system and/or a large audio amplifier may need guaranteed power and thus may be wired directly to the battery with its own Positive AND Negative wires connected directly to the battery.

"Extra" wires on the Positive terminal usually feed special circuits that either need to be 'Hot" all the time, even when the key is off, OR need the current that can be supplied only by its own dedicated power supply wire.

Extra wires connected to the Negative terminal "usually" serve electrical devices that require their own, solid ground connection.