Final answer:
D83 is a television show, but without additional information, it is unclear what it signifies during its first season.
Step-by-step explanation:
D83 refers to a television show, but without more context it is unclear which show is being referred to. It is possible that D83 is a specific episode number, a channel code, or a production identification code. Without additional information, it is not possible to determine what D83 signifies during its first season.