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2. Graph paper - Wikipedia

   en.wikipedia.org/wiki/Graph_paper

   Graph paper is writing paper with a regular grid for plotting graphs, curves and coordinates. Learn about different formats, such as quad, dot, engineering and logarithmic paper, and their origins and applications.

3. Dots per inch - Wikipedia

   en.wikipedia.org/wiki/Dots_per_inch

   Dots per inch (DPI) is a measure of spatial printing, video or image scanner dot density. Learn how DPI affects the quality and resolution of printed output, and how it differs from pixels per inch (PPI) in digital images.

4. Lines per inch - Wikipedia

   en.wikipedia.org/wiki/Lines_per_inch

   Lines per inch (LPI) is a measure of printing resolution, while dots per inch (DPI) is a measure of screen resolution. Learn how to convert LPI to DPI and vice versa, and see examples of LPI values for different types of paper and devices.

5. ANSI/ASME Y14.1 - Wikipedia

   en.wikipedia.org/wiki/ANSI/ASME_Y14.1

   ANSI/ASME Y14.1 defines a series of paper sizes based on the letter size for decimal inch drawings. It also covers metric drawing paper sizes based on ISO 216 and ISO 5457 standards.

6. Amsler grid - Wikipedia

   en.wikipedia.org/wiki/Amsler_grid

   The Amsler grid is a tool to monitor vision problems caused by macular or optic nerve damage. It consists of a grid of lines or dots that the person looks at with each eye separately and marks any blurry, wavy or missing areas.

7. Ruled paper - Wikipedia

   en.wikipedia.org/wiki/Ruled_paper

   Ruled paper is writing paper printed with lines as a guide for handwriting. Learn about the different types of ruled paper, such as graph, quadrille, musical, and Seyès, and their regional standards and history.