Write a capital letter that appears to have a perpendicular line segment

Hence, the common alphabets in which the perpendicular line segments are easily visible are:

E F H LT

Step-by-step explanation:

Perpendicular lines or line segments intersect to form a right or 90 degree angle.

In this particular font, in uppercase

B D E F H I K L M N P R and T all have perpendicular segments,

G has a short perpendicular segment

J has a perpendicular segment which ends in a curve

U has two perpendicular segments joined by a curve