What Do You Call These Outdoor Patio Lights?

I am trying to figure out what these lights are called. I know they were used alot in the past to light up car lots and as christmas lights in the 50′s. I still see them today in outdoor restaurant patios and at firework stands. They are full size light bulbs on a string. I would like to purchase some for my outdoor patio but I cant find where they are sold.