The term 'Sardine Holder' is a job title for someone who works with TIN. This person is responsible for the storage and handling of sardines in TIN containers. They must ensure that the sardines are properly stored and handled in order to maintain their freshness and quality. The job requires knowledge of the properties of TIN and how it interacts with food products. The holder must also be aware of any health and safety regulations related to the handling of food products.