Big Thumb is a big truck that Nissan Diesel Industry (now UD Truck) was once producing. The same car was also produced with the same name at Renault Samsung in Korea. It was released in 1990 as a successor to the Lesna. Long-term production with repeated minor changes, Quon of the successor appears in 2004, was also produced until 2005. The name of a car is a "big thumb" if translated directly, but it has the meaning of "a great father" and "a reliable father".