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.
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Parallel: E, F, H, I, M, N, O (in some fonts), U, Z.
Perpendicular: E, F, G, H, L, T.
Many more letters have perpendicular lines in serif fonts.
Also, there are letters, such as D, in which the ends of the curved section are parallel to one another and are perpendicular to the vertical element.
Well, honey, the letter "I" has two parallel lines, and the letter "T" has one perpendicular line. So, there you have it, straight as an arrow.
W
There are letters in the alphabet with both parallel and perpendicular lines. In alphabetical order, they are E, F, and H. If the joining point can be considered perpendicular and parallel, then B, D, P, and R also match the criterion.
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.
The letter's "H", "I", "E", and "F".
E,f,h,i,n