What does 'Survivor Car' Mean?

I don't consider mileage in surviving. A more modern example but I saw a car - a Shelby Duster (the turbo FWD deal). When it was retired it was well over 350,000. It had a replaced clutch, axles, tires, struts, brakes, and I think some front end parts. It had a few dings and dents and the driver's seat was a bit worn but the owner was an on-the-road salesman. Other than wear parts it was 100% as delivered and nobody pulled the interior parts or messed with bodywork. That is a survivor to me.