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  2. Ruled paper - Wikipedia

    en.wikipedia.org/wiki/Ruled_paper

    It has 1 ⁄ 2 in (12.7 mm) spacing between ruling lines, with a single margin drawn down the center of the page. Wide ruled (or legal ruled) paper has 11 ⁄ 32 in (8.7 mm) spacing between horizontal lines, with a vertical margin drawn about 1 + 1 ⁄ 4 inches (32 mm) from the left-hand edge of the page. It is commonly used by American ...

  3. Coil binding - Wikipedia

    en.wikipedia.org/wiki/Coil_binding

    A spiral bound notebook. Coil binding, also known as spiral binding, is a commonly used book binding style for documents. This binding style is known by a number of names (some trademarked) including spiral coil, color coil, colorcoil, ez-coil, plastic coil, spiral binding, and coilbind.

  4. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  5. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.

  6. Graph paper - Wikipedia

    en.wikipedia.org/wiki/Graph_paper

    It is available either as loose leaf paper or bound in notebooks or Graph Books. It is commonly found in mathematics and engineering education settings, exercise books, and in laboratory notebooks. The lines are often used as guides for mathematical notation, plotting graphs of functions or experimental data, and drawing curves.

  7. Ulam spiral - Wikipedia

    en.wikipedia.org/wiki/Ulam_spiral

    The Ulam spiral or prime spiral is a graphical depiction of the set of prime numbers, devised by mathematician Stanisław Ulam in 1963 and popularized in Martin Gardner's Mathematical Games column in Scientific American a short time later. [1] It is constructed by writing the positive integers in a square spiral and specially marking the prime ...