stock shot (SS) meaning in Information Science terminology / glossary / dictionary is:
In motion pictures, a standard take of a scene (example: train passing through countryside), subject (elephants in the wild), landmark (Eiffel Tower from above), or event (D-Day landing), archived, usually in a film library with other shots, to be used as a resource by filmmakers as needed to reduce costs or provide historical accuracy, especially in the production of documentaries. To see examples, try a search in Footage.net. Synonymous with library shot. Compare with stock photograph. See also: stock footage.