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Dot grid
— ruled in the form of dots placed at the corners of imaginary grid. It is quite rare, but it can be extremely convenient for illustrations for technical projects: dots create a convenient base for drawing and at the same time almost do not clutter up the drawing with unnecessary elements (as happens, for example, in the case of grid). In addition, such a ruler is often performed using the perforation method, which further contributes to its invisibility when viewing the completed drawing.