Number vs. no. vs. # in scientific papers?
Use "Item 2", not "Item number 2" (and not No. or № or #). Similarly use "Figure 4" not "Figure number 4", and "Paragraph 3" not "Paragraph number 3".
Use "Item 2", not "Item number 2" (and not No. or № or #). Similarly use "Figure 4" not "Figure number 4", and "Paragraph 3" not "Paragraph number 3".