Q. When a word beginning with an uppercase letter, either because it begins the sentence or because it’s a proper noun, is stammered/stuttered, should the second and following instances of the letter also be uppercase? I’m looking at “P-peter,” which looks really strange to me, and I would write it “P-Peter,” but I can’t find any examples in CMOS.
A. “P-Peter” is the logical choice. By capitalizing the second “P,” you are unambiguously signaling repetition of the first letter as such. Additional letters would also be capitalized: “P-P-Peter.” If the word would normally be lowercased, a capital letter still makes sense at the beginning of a sentence—“P-Please, p-please . . .”—though some authors will prefer lowercase. Choose one approach and apply it consistently.