Nonce words other than "means" can invoke claim interpretation under 35 USC 112(f).

Nautilus, Inc. v. Biosig Instruments, Inc. (2014) brings to light conflicting views on how to interpret the requirement of 35 USC 112, second paragraph, also known as the definiteness requirement. 35 USC 112, second paragraph, states that “[T]he specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as the invention.”