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"ruled copy" or "ruled paper" is a type of writing paper that has lines printed on it as a guide for handwriting. The main purpose of these lines is to help users keep their writing neat, consistent, and organized.

Here's a more detailed description:

 * Lines: The most defining feature is the presence of evenly spaced horizontal lines. These lines are typically fine and printed in a light color (like grey, blue, or green) so that they are visible enough to guide writing but don't overpower the ink.

 * Margins: Ruled paper often includes vertical lines to indicate margins on the left side (and sometimes the right) of the page. These margins help define the writing area and keep the text from running off the edge.

 * Types of Ruling: There are various types of ruling depending on the intended use and common handwriting styles. Some common types include:

   * Single-ruled: Most common for general writing, with lines spaced typically 8mm apart.

   * Double-ruled: Features two parallel lines with a larger space between them, often used for practicing specific handwriting styles or for younger children.

   * Four-ruled (or Quad-ruled/Handwriting Paper): Has more lines, often including a dashed line in the middle of each space, to guide letter formation and height, particularly for children learning to write.

   * Squared/Graph paper: Features a grid of squares, commonly 5mm, used for maths, drawing, or precise diagrams.

   * Seyès ruling: A specific type of ruling used in French schools, with heavy vertical lines and lighter intermediate lines to guide specific letter heights.

   * Gregg ruled: Specialized for stenography, with specific line spacing.

 * Paper Quality and Size: Ruled copies come in various paper qualities (measured in GSM - grams per square meter, indicating thickness) and standard sizes like A4, A5, or smaller "copy" sizes commonly used in schools.

 * Binding: They can be found as loose sheets, in pads, or most commonly as notebooks with spiral binding, perfect binding (glue), or stitched binding.

 * Purpose: Ruled copies are widely used by students for notes, homework, and practice, as well as in offices and for personal use where neat and organized writing is desired.