The existing box has one black wire and three white wires twisted around each other coming out of it. The existing fixture has one black wire and one white wire. The black was connected to the black and the white to the 3 twisted white. Then a copper wire from the fixture was wrapped around those wires. The NEW fixture has three wires. One is labeled "N" and one is labeled "L". The 3rd wire has an symbol on it of 3 horizontal lines and 1 vertical line. Looks a little like a sailboat! There is also a copper wire.
So... if I connect the "N" to the 3 twisted white wires and I connect the "L" to the black wire, what do I do with the 3rd wire?