Odd letter in the barnamala

I am an odia born and brought up in England, so I didn't learn it in school. My parents taught me how to speak Odia and now I am try to learn how to read and write it. Google keyboard has a letter which even my parents don't know, it Looks like this ଵ. Can someone tell me what it is, how is it pronounced and why my parents who studied in Odisha in the 60s don't know about it. Thank you.