I had a toggle switch like that in a Ford Maverick Grabber that I once owned. It was factory equipment, but I bought the car used and it had no owner’s manual. The switch turned on two lights mounted in the grill that were so dim you had to light a match to see if they were on. I never knew what the lights were for, so I had a mystery switch that turned on mystery lights. (The garage that serviced that Maverick told me that they were “sport lights”).
Years ago, when I was a college student, I worked in the summer in the audio visual department of the library repairing equipment. One day, the janitor of the building came down and asked me to help him by being available to regulate the air conditioning if there were complaints. He took me to the mechanical room, gave me a key to the room, and showed me a switch. “If you get complaints that it too warm, flip the switch to the opposite direction. If you get complaints that is too cold, flip the switch in the opposite direction. Be sure that the person who complained sees you flip the switch”.
“What does the switch do?” I asked. “Absolutely nothing”, the janitor replied. "I installed it myself. However, the complainer doesn’t know that. Just tell them that the temperature will be fine in five to ten minutes ". It worked.