A letter I i.
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There are 11 letters with only one line of symmetry.
Only the I has a horizontal line of symmetry. Visualize folding PIZZA in half through the letters. Only the I would fold down perfectly on top of itself, so it has a horizontal line of symmetry.
A, h, i,
A line has only 1 line of symmetry that i know of.
A B C D E H I K M O T U V W X Y the letters above all have a line of symmetry