ephemera
/ɪˈfɛmərə/ ih-FEM-er-uh
from the Ancient Greek ephḗmerosἐπί (epí, upon) + ἡμέρα (hēméra, day) — lasting only a day
things of brief existence; objects made to be used once and discarded — tickets, posters, letters, menus, moments — that somehow endure as evidence of the fleeting.