The answer to this probably depends on (a) the font and (b) wheter the uppercase letter or the lowercase letters are considered.
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
and in lowercase
b d h i k l m n p r and u all have perpendicular segments
a f g j and t all have perpendicular segments with curved parts.
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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.
Me either LOL i am still searching to find the answer
They are perpendicular line segments
Oh honey, you're in for a treat! The letters "O" and "S" have no parallel, perpendicular, or intersecting line segments. They're just doing their own thing, floating around without a care in the world. Just like me at a buffet table!
Each of the eight line segments is perpendicular to 2 line segments. So there are 8 pair in all.