已解决问题
do you want to learn '' සිංහල '' ( sinhala )?

Hi, friend. What is the letter in the squares? Can you send an email to feedback(at)italki(dot)com. It seemed that Sinhala letters can not be shown on italki yet. Look forward to your reply on this.

That's Indic script needs support for Indian Standard Code for Information Interchange(ISCII)