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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    PDF graphics use a device-independent Cartesian coordinate system to describe the surface of a page. A PDF page description can use a matrix to scale, rotate, or skew graphical elements. A key concept in PDF is that of the graphics state, which is a collection of graphical parameters that may be changed, saved, and restored by a page ...

  3. Page Up and Page Down keys - Wikipedia

    en.wikipedia.org/wiki/Page_Up_and_Page_Down_keys

    The Page Up and Page Down keys (sometimes abbreviated as PgUp and PgDn) are two keys commonly found on computer keyboards . The two keys are primarily used to scroll up or down in documents, but the scrolling distance varies between different applications. In word processors, for instance, they may jump by an emulated physical page or by a ...

  4. History of PDF - Wikipedia

    en.wikipedia.org/wiki/History_of_PDF

    History of PDF. The Portable Document Format (PDF) was created by Adobe Systems, introduced at the Windows and OS/2 Conference in January 1993 and remained a proprietary format until it was released as an open standard in 2008. Since then, it has been under the control of an International Organization for Standardization (ISO) committee of ...

  5. PDF/A - Wikipedia

    en.wikipedia.org/wiki/PDF/A

    PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...

  6. Book frontispiece - Wikipedia

    en.wikipedia.org/wiki/Book_frontispiece

    Book frontispiece. A frontispiece painted by William Blake for his Milton a Poem, published in 1810. A frontispiece in books is a decorative or informative illustration facing a book's title page, usually on the left-hand, or verso, page opposite the right-hand, or recto page of a book. [ 1] In some ancient editions or in modern luxury editions ...

  7. List of typographical symbols and punctuation marks - Wikipedia

    en.wikipedia.org/wiki/List_of_typographical...

    Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.

  8. Stain removal - Wikipedia

    en.wikipedia.org/wiki/Stain_removal

    Soaking. This is a common method used in households to remove a variety of stains. Depending on the stains composition, the stained material is left to soak in a container of warm or cool water and solvent. Such solvents can include laundry detergent, bleach, peroxide, vinegar, or a cleaning product with enzymes.

  9. Stop word - Wikipedia

    en.wikipedia.org/wiki/Stop_word

    Stop words are the words in a stop list (or stoplist or negative dictionary) which are filtered out (i.e. stopped) before or after processing of natural language data (text) because they are deemed insignificant. [1] There is no single universal list of stop words used by all natural language processing tools, nor any agreed upon rules for ...