final section of a musical or literary composition, added on as a "tail" or appendix
The novel's final chapter is a brief coda that tells a few facts about the characters in the years following the story.
cauda (tail of an animal) (Latin)
ie, conclusive part of the lunch, is done by soda (coda) by watching music on television. At the end of the musical performance everyone took pictures with their KODAk cameras.