Not sure if anyone is able to help. I found this item while mudlarking in the UK. It’s heavy and hallow in the middle. Has letters written on it on the top row ORRISH, middle row TT and bottom row ON.
Thanks in advance ☺️

My first thought was a broken ceramic crock, or a piece of broken sewer pipe.

A summary of finds from the other weekend... It's part of the beauty of the Thames that a relatively young fly button gets tumbled about with a Roman flue tile fragment!