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.
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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".
6 uppercase letters: E F G H L T1 lowercase letter: t