This is the 439th most frequent Turkish word.
onları
"Them" (accusative form).
The word 'onları' functions as a direct object pronoun replacing 'them'.
Onları sinemada gördüm.
I saw them at the cinema.
Here, 'onları' is again a direct object, referring to the thing or persons to be sent.
Onları bana gönderirsin, lütfen.
Please send them to me.
In this sentence, 'onları' serves as a direct object pronoun, indicating the persons or items mentioned.