The letter's "H", "I", "E", and "F".
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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.
Both!! gezz that's easy :P
They are E and H because both have perpendicular lines that meet at right angles which is 90 degrees
In a square adjacent sides are perpendicular to each other and opposite sides are parallel to each other.
To indicate that a pair of lines are parallel you mark them both with an arrow. If there is another pair of parallel lines on the same shape you mark those with a double arrow.