In a table, I would like to use abbreviate the word number. The column heading is namely:
Number of items
In what is the correct abbreviation for the word “numbers”? both "No" and "#" are suggested as abbreviations. The Chicago Manual of Style (16th ed.) in §10.43 also suggests "No". However, I am not sure these abbreviations are meant to be used with cardinal numbers.
Question: What is the correct abbreviation of number in this context?