The term 'potato gadget' refers to three kitchen tools used for preparing potatoes. The first is a PEELER, which is a tool with a sharp blade used to remove the skin from potatoes. The second is a masher, which is a tool used to mash cooked potatoes into a smooth consistency. The third is a ricer, which is a tool used to press cooked potatoes through small holes to create a light and fluffy texture. All three of these tools are essential for making delicious potato dishes.