You could argue that "B", "D" and lowercase "t" also have perpendicular lines but they are not straight lines so I don't know if those count.
W
T p h
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.
The letter's "H", "I", "E", and "F".
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.
Yellow
W
T p h
t
M
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.
E F and H
The letters A, K, M, N, R, V, W, Y, and Z all have lines in them that are not perpendicular.
The letter's "H", "I", "E", and "F".
N, M and H
Perpendicular lines are ones that make right angles when they meet. For instance the letters T H E and L are all made of perpendicular line segments.
X and T because the they can still make the T shape and still be perpendicular