This is the 16th most frequent Italian word.
delle
"Delle" is the Italian plural feminine form of "some" or "of the."
In this sentence, 'delle' is the contraction of 'di' and 'le', functioning as an indefinite article equating to 'some' in English when referring to feminine plural nouns.
Delle rose rosse sono sul tavolo.
Some red roses are on the table.
Here, 'delle' again is the contraction of 'di' and 'le', and it specifies an uncertain quantity of feminine plural items, which in this case are 'monete' (coins).
Ho trovato delle monete nel cassetto.
I found some coins in the drawer.
In this example, 'delle' serves as a partitive article, meaning 'of the', introducing a plural definite noun ('nuove regole').