The unit of font size is points, and the conversion method in millimeters is: 1 mm =2.83 points; The conversion units of pound and number are: 1 pound = 1/72 inch, 1 inch =25.4 mm. The corresponding relationship between "font size" and "pound" is initial 1 number, small 12 number, small 23 number and small number. In actual use, you can set the font size according to your needs, whether it is extra large or small with sleeves.