When pairs of letters need to be spaced more closely to appear correctly are called kerned pairs?

It is true that when pairs of letters that need to be spaced more closely to appear correctly are called kerned pairs. Kerning in typography, is the process of making space adjustments between characters in an equal font, usually to attain a visually attractive outcome. Kerning infers a decrease of space, but it can also mean more of space. Kern pairs are generated to enhance the distance between two letters when the normal spacing is below ideal.

angle Q,T,C, and B are right (90°)

angle D = R (from the sign)

angle E = S (from the sign)