Three

Riddle: Pronounced as one letter, But look and you'll see, That really I'm written with three. I'm read from both ends, The same either way. What am I?

Answer: I am an eye, or an ewe. Source: https://www.riddles.com/index.php/500

Pronounced as one letter, But look and you'll see, That really I'm written with three. I'm read from both ends, The same either way.
What am I? — Three by Anonymous Riddle