Palindrome

Palindrome - a word, phrase, verse, or sentence that reads the same backward or forward.
Word

What word, when written in capital letters,
is the same forwards, backwards and upside down?





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Pronounced as one letter but written with three, only two different letters are used to make me.
I'm double, I'm single I'm black, blue, and gray.
I'm read from both ends and the same either way.
= Eye