This meaning refers to a flat surface or platform, typically found on ships, in an observation area, or as part of a train. It serves various purposes, such as providing space for movement, relaxation, or viewing.
I was waiting with my friend on the train's vestibule.
deck (e.g. tape, cassette)
This meaning relates to a physical medium used to hold or store audio or video recordings. It often refers to devices used to play or record these tapes or cassettes.