Reply To: Use of capital word indicator with letters and prime signs
Thank you for the question, Connie.
8.4.2 in the Rules of UEB tells us that the effect of a capitalized word indicator is terminated by a nonalphabetic symbol. A prime sign is most certainly nonalphabetic, so a capitalized word indicator would not work for A′B′C′D′ (A-prime, B-prime, C-prime, D-prime).
–Kyle