Translation:This category contains five objects.
Can I use items? Kinds of thing? I have the impression that przedmiot has the sense of being an object that be seen and felt, and at least in English I don't think we'd say a category can contain an object in this sense. I know in specialised areas like computer programming you can have objects that aren't seen or felt. But I don't think in layman's terms we think of it like that. I don't mean to be nit-picky. Just trying to get a sense of how przedmiot is used in Polish.