Description : Pronounced as one letter, And written with three, Two letters there are, And two only in me. I'm double, I'm single, I'm black blue and grey, I'm read from both ends, And the same either way. -Riddles
Last Answer : Eye. It's pronounced like the letter i', but written with three letters. There are only two letters used ( e' and y'). The eye is double with two e's and represents a single eye. The ... which are black, blue and gray. And lastly, the eye is a palindrome, spelled the same forward and backward.