I concur with Biffo that you'd be not likely to confuse "No." Using the phrase "No" as soon as you think about it. But I do at times encounter a split-2nd hesitation when reading a sentence with "No.", specially if there is a Room between it and the next number: https://lorenzogpwce.bloggactivo.com/35666859/5-easy-facts-about-no-scrub-cover-described