Plurals

Q. Can CMOS weigh in on the pluralization of trademarked materials? We have an internal debate over “iPhone 7s” versus “iPhones 7.”

A. “iPhone 7s” is the default; use “iPhones 7” only for phones belonging to attorneys-general and mothers-in-law.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]