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  2. Plus and minus signs - Wikipedia

    en.wikipedia.org/wiki/Plus_and_minus_signs

    When placed after special sets of numbers, plus and minus signs are used to indicate that only positive numbers and negative numbers are included, respectively. For example, + is the set of all positive integers and is the set of all negative integers. In these cases, a subscript 0 may also be added to clarify that 0 is included.

  3. List of iPad accessories - Wikipedia

    en.wikipedia.org/wiki/List_of_iPad_accessories

    The iPad is an iPadOS-based (previously iOS) line of tablet computers designed and developed by Apple Inc.; it has a wide variety of accessories made by Apple available for it, including a screen cover specifically for the respective models of iPad called Smart Cover, as well as a number of accessories to allow the iPad to connect to other devices, some of which enable non-touchscreen input.

  4. Nixie tube - Wikipedia

    en.wikipedia.org/wiki/Nixie_tube

    A Nixie tube (English: / ˈ n ɪ k. s iː / NIK-see), or cold cathode display, [1] is an electronic device used for displaying numerals or other information using glow discharge. The glass tube contains a wire-mesh anode and multiple cathodes , shaped like numerals or other symbols.

  5. Numerals in Unicode - Wikipedia

    en.wikipedia.org/wiki/Numerals_in_Unicode

    Grouped by their numerical property as used in a text, Unicode has four values for Numeric Type. First there is the "not a number" type. Then there are decimal-radix numbers, commonly used in Western style decimals (plain 0–9), there are numbers that are not part of a decimal system such as Roman numbers, and decimal numbers in typographic context, such as encircled numbers.

  6. Dot-matrix display - Wikipedia

    en.wikipedia.org/wiki/Dot-matrix_display

    A 16×2-character dot-matrix display, where each character is made from a grid of 5×7 dots. A dot-matrix display is a low-cost electronic digital display device that displays information on machines such as clocks, watches, calculators, and many other devices requiring a simple alphanumeric (and/or graphic) display device of limited resolution.

  7. Seven-segment display - Wikipedia

    en.wikipedia.org/wiki/Seven-segment_display

    A seven-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays. Seven-segment displays are widely used in digital clocks , electronic meters, basic calculators, and other electronic devices that display numerical information.

  8. Overview of the updated AOL app experience for iOS

    help.aol.com/articles/overview-of-the-updated...

    Tap the three dots button in the lower-right corner and tap on Forward icon. Compose your message and tap Send. Delete an email. To delete an email in the app, there are a few options. From the message list, swipe to the left on a message to delete. Tap on a message to open it and tap the trash can in the lower left. Delete multiple messages ...

  9. Negative number - Wikipedia

    en.wikipedia.org/wiki/Negative_number

    A special case of unary negation occurs when it operates on a positive number, in which case the result is a negative number (as in −5). The ambiguity of the "−" symbol does not generally lead to ambiguity in arithmetical expressions, because the order of operations makes only one interpretation or the other possible for each "−".