e·phem·er·a

/əˈfem(ə)rə/ • noun

Things that exist or are used or enjoyed for only a short time. items of collectible memorabilia, typically written or printed ones, that were originally expected to have only short-term usefulness or popularity

Ephemera (ἐφήμερα) is a noun, the plural neuter of ephemeron and ephemeros, Greek and New Latin for ἐπί – epi "on, for" and ἡμέρα – hemera "day" with the ancient sense extending to the mayfly and other short lived insects and flowers and for something which lasts a day or a short period of time.

Ephemera (singular: ephemeron) are any transitory written or printed matter not meant to be retained or preserved. The word derives from the Greek ephemeros, meaning "lasting only one day, short-lived".[1] Some collectible ephemera are advertising trade cards, airsickness bags, bookmarks, catalogues, greeting cards, letters, pamphlets, postcards, posters, prospectuses, defunct stock certificates or tickets, and zines.