if the resolution of a printer is 1200 dpi the number of dots per square inch is
Dots per inch Dots per inch (DPI, or dpi)[1] is a measure of spatial printing or video or image scanner dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch (2.54 cm).
Significant figures The significant figures of a number are digits that carry meaning contributing to its measurement resolution. This includes all digits except:[1]