The letters X L T
In the upper case Roman alphabet they are: C, I, J, O and S. However, in the case of C, O and S, there are parts of the curved segments which are parallel.
Letters that have parallel line segments are H, E, F, M, and N
all letters have a line of symmetry
O, l, S, Z
The letter - H
None in the Roman alphabet.
25 o because sOme of them are perpendicular
The letters X L T
In the upper case Roman alphabet they are: C, I, J, O and S. However, in the case of C, O and S, there are parts of the curved segments which are parallel.
I
E
Letters that have parallel line segments are H, E, F, M, and N
all letters have a line of symmetry
In the case of upper case letters in the Roman alphabet, and allowing tine segments of lines that are curved, they are: B, C, D, E, F, G, H, M, N, O, P, Q, R, S, U, Z.
It depends on the font. Using this font, I count 8 upper case letters: E F H I M N W Z and 2 Lower case letters: w z
t