The answer depends of the font.
In broad terms, in the upper case letters:
F, G, J, L, P, Q and R.
The others have reflective (or line) symmetry, or they have rotational symmetry, or both.
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Letters that have a vertical line symmetry: WTYUIOAHXVM Letters that have a horizontal Line symmetry: EIODHKCB
all letters have a line of symmetry
bcdefgjklpqr
The letters with half turn symmetry in the alphabet are.......H, I, N, O, S, X, and Z.
The letters H and Z have both line symmetry and rotational symmetry