The letters S and N have point symmetry but not line symmetry.
x
Z S H and N
The list provided with the question doesn't include any letters that meet the requirements.
Letters that have a vertical line symmetry: WTYUIOAHXVM Letters that have a horizontal Line symmetry: EIODHKCB
It is the same as in shapes, the ability to be divided into two equal halves either vertically or horizontally. Not all letters have a line of symmetry, and some have two (H, X, O).
A, B, C, D, E, H, I, K, M, O, T, U, V, W, X, and Y all have point symmetry
Lower case "o" and "x" both have two lines of symmetry. Upper case letters with two lines of symmetry are: "O," "X," "H" and "I."
H,I,O,X,
by divide in two halves equal
Icebox, decided
Three capital letters that have two lines of symmetry are "O", "H", and "I" since they can be reflected either horizontally or vertically and still look the same.