Question

Find a word (written in standard capital letters) that is unchanged when reflected in a horizontal line and in a vertical line. The word must appear in a dictionary (in a language of your choice) in order to be a valid solution.

Answer 1

any of HOH, HOOH, IOI, OHO, XOX, XXX

Explanation:

Only the letters H, I, O, X are both vertically and horizontally symmetric. There aren't a lot of palindromes that can be made with these letters. Many are acronyms or have meaning only in special contexts (not all of which are family-rated).