https://forum.wordreference.com/threads/abbreviation-of-number-n-n%C2%B0-nr-nbr-no.264328/
Oct 17, 2006 · The abbreviation "No." is used only in front of an actual number, e.g., No.5 Paragraph No.7 Husband No. 2 If you are using the word "number" as a regular noun, it c