Q. How would you pluralize “ram’s horn” when there are seven of them (i.e., more horns than one ram would naturally have)? Logically, it should be “rams’ horns,” but there is an argument that this should be treated in the same way as cowhides or sheepskins. In that case, wouldn’t it be “ram horns”? There are also votes in the office for “ram’s horns.”

Q. Is it the three R’s or Rs? The NYT seems to use R’s—I thought I’d double check with you folks before I publish something.

Q. The February 2012 issue of National Geographic has a headline and subtitle that read, “What Dogs Tell Us: The ABC’s of DNA.” While I realize that National Geographic may have their own style guide, would Chicago style eliminate that apostrophe from ABC’s?

Q. Hello, Wise Ones. If you were me, how would you pluralize B-26? B-26es? B-26s? (Not, I’m pretty sure, B-26’s.) None of them look right to me.

Q. Periods always go inside quotation marks. I have been told that the exception is when the matter within the quotation marks is a number or single letter. For example: The figure is impressed “1”. Please tell me if I have been misinformed!

Q. In a policy, I have to indicate that the word facility could be plural. The person editing the document has written it as facility(s). What is the correct way to portray nouns that end in y when necessary to indicate they could be singular or plural?

Q. The plural of curriculum is curricula. Why does the dictionary list symposiums as an acceptable plural for symposium? And does the rule differ for every plural of words ending in -um?