Riddle of the Day

[Gizmokid2005]

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 gray,
I'm read from both ends,
And the same either way.
What am I?

ANSWER (Congrats layla): Eye

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NEXT RIDDLE:

Aunt Mary takes fruit, cake, and cookies for her picnic. She has three boxes for them - one is labeled COOKIES, one is labeled CAKE and one is labeled FRUIT. Aunt Mary likes to fool everyone so she has put every single thing in the wrong box. At the picnic, she tells everyone that the FRUIT is not in the CAKE box. Where is the cake?