Objects from real life or from the real world, as opposed to theoretical constructs or fabricated examples.
2011, Norman Davies, Vanished Kingdoms, Penguin, published 2012, page 28:
It might be possible, for example, to work backwards from the known realia of Visigothic Spain.
(linguistics) Words and expressions for culture-specific material elements.
(libraries, information science) Physical objects in a library collection that do not fit into traditional categories of media, whose media are the objects themselves, as opposed to their informational content, such as artifacts, tools, memorabilia, and naturally-occurring specimens.