The Romanian language has two indefinite articles, a grammatical hitch similar to the two definite articles in Dutch.
In Romanian, the indefinite article for any given noun is either "o" or "un."
"O" is always the correct article for a "feminine" noun, and "un" for a "masculine" or "neuter." However, there is nothing inherent in a noun showing its gender or lack of it.
Romanian speakers act like the Dutch on their "de" and "het" the distinction is just something that you know.