Today’s word prompt on the HSMSHS page on Facebook is tin: 1) a silvery-white metallic chemical element. 2) a lidded airtight container made of tinplate or aluminium. 3) chiefly Brit. a sealed tinplate or aluminium container for preserving food; a can. 4) an open metal container for baking food.
The trusty family biscuit tin fits the category for this one.