H, M, N
Kind of U (because the line curves at the end)
If it doesn't have to be all the way vertical... A, V, W, X, Y
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c
O, l, S, Z
14 capital letters of the Latin alphabet and 7 lower case letters have planes of symmetry:Capital letters:ACDHIMOSTUVWXYLower case letters:closvwx
E s i o
ALL letters have at least one line of rotational symmetry. However - if you mean reflective symmetry, the letters F, G, J, L, P, Q, R, S, & Z do not.