To write a small number such as a square sign on Microsoft word, hold down 'Ctrl', 'Alt' and press the '+' button. This mill make the text 'superscript', which means that it w â¦ ill be smaller, and appear in line with the top of the normal text.o write a small number such as a square sign on Microsoft word, hold down 'Ctrl', 'Alt' and press the '+' button. This mill make the text 'superscript', which means that it w â¦ ill be smaller, and appear in line with the top of the normal text.