Does an o with a line through it mean the letter o or zero? Leave a Comment / GeneralFinest ReplyThe letter ‘O’ with a slash through it is the quantity zero.Extra SolutionsWat do that meansRead More: What tims is 9pm PST in Central time? How many linear ft in 1 acre? Related posts:How many spark plugs are in a diesel engine? What times what equals 36? How do you say i love you backwards? How did Boris Yeltsin respond to the Communist coup attempt? What month comes after September? READ: What is an opposite word for reap?