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  2. Presentation slide - Wikipedia

    en.wikipedia.org/wiki/Presentation_slide

    A slide is a single page of a presentation. A group of slides is called a slide deck. A slide show is an exposition of a series of slides or images in an electronic device or on a projection screen. Before personal computers, they were 35 mm slides viewed with a slide projector [1] or transparencies viewed with an overhead projector.

  3. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    In the Etruscan system, the symbol 1 was a single vertical mark, the symbol 10 was two perpendicularly crossed tally marks, and the symbol 100 was three crossed tally marks (similar in form to a modern asterisk *); while 5 (an inverted V shape) and 50 (an inverted V split by a single vertical mark) were perhaps derived from the lower halves of ...

  4. Slide show - Wikipedia

    en.wikipedia.org/wiki/Slide_show

    A slide show in Germany. A slide show, or slideshow, is a presentation of a series of still images on a projection screen or electronic display device, typically in a prearranged sequence. The changes may be automatic and at regular intervals or they may be manually controlled by a presenter or the viewer.

  5. Presentation program - Wikipedia

    en.wikipedia.org/wiki/Presentation_program

    In computing, a presentation program (also called presentation software) is a software package used to display information in the form of a slide show. It has three major functions: [1] an editor that allows text to be inserted and formatted; a method for inserting and manipulating graphic images and media clips; a slide-show system to display ...

  6. Presentation - Wikipedia

    en.wikipedia.org/wiki/Presentation

    Microsoft PowerPoint and Google Slides are effective tools to develop slides, both Google Slides and Microsoft PowerPoint allows groups to work together online to update each account as it is edited. Content such as text, images, links, and effects are added into each of the presentation programs to deliver useful, consolidated information to a ...

  7. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    The Maya numerals for numbers 1 through 19, written in the Maya script In the Pre-Columbian Americas , the Maya civilization that flourished in Mexico and Central America during the 1st millennium AD developed a unique tradition of mathematics that, due to its geographic isolation, was entirely independent of existing European, Egyptian, and ...