C, O, and S.
W
H,I,O,X,
E is the only letter.
W e
The letters in the alphabet that contain parallel lines are "H," "I," "K," "N," "X," and "Z." These letters have two or more straight lines that run alongside each other without intersecting. The letter "T" also contains perpendicular lines, as it has one vertical line intersected by a horizontal line at a right angle.