"un rechin, doi rechini"
Translation:a shark, two sharks
If you're talking about the last "i" in "rechini", it is actually used to mark palatalization of the preceding n. That's how a lot of plurals are formed in Romanian.
If you're not familiar with palatalization, just think of it this way: it's like trying to pronounce a very short "i" after the consonant, while not adding an extra syllable.
I was trying to read up on it and from what i understood from Wikipedia was that the final i softens the previous consonant sound. Would this be an acurate interpretation of how it's pronounced?