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  2. Variable-message sign - Wikipedia

    en.wikipedia.org/wiki/Variable-message_sign

    A row matrix VMS is a hybrid of the two types, divided into two or three rows like a character matrix display, except each row is a single long dot matrix display instead of being split per character horizontally. Overhead variable message signs are today available in three form factors: front access, rear access, and walk-in.

  3. Electronic symbol - Wikipedia

    en.wikipedia.org/wiki/Electronic_symbol

    Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...

  4. Looped square - Wikipedia

    en.wikipedia.org/wiki/Looped_square

    The ⌘ symbol as seen on a Swedish road sign (No. H22) for national heritage The ⌘ symbol on a 1977 Finnish 5 penni coin. The looped square (⌘), also known as Saint John's Arms, Saint Hannes cross (related to Swedish sankthanskors, Danish johanneskors, and Finnish hannunvaakuna), and as the command-key symbol due to its use on the command key on Apple computer keyboards, is a symbol ...

  5. Timeline of electrical and electronic engineering - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_electrical_and...

    3½-inch floppy (2-sided, 875 kB) N/A 1980: VIC-20: Commodore Business Machines 1981: IBM Personal Computer (8088 processor) IBM: 1981: MS-DOS 1.0: Microsoft: 1981 "Wet" solar cell: Bayer AG: 1982: Commodore 64: Commodore Business Machines 1982: First commercially marketed large-vocabulary speech recognition: Kurzweil Applied Intelligence and ...

  6. Digon - Wikipedia

    en.wikipedia.org/wiki/Digon

    A regular digon has both angles equal and both sides equal and is represented by Schläfli symbol {2}. It may be constructed on a sphere as a pair of 180 degree arcs connecting antipodal points, when it forms a lune. The digon is the simplest abstract polytope of rank 2. A truncated digon, t{2} is a square, {4}. An alternated digon, h{2} is a ...

  7. Best hearing aids for seniors in 2025, according to experts ...

    www.aol.com/lifestyle/hearing-aids-for-seniors...

    One of the RIC models also offers CROS for single-sided hearing loss. ITE – There are two in-the-ear models that come in six colors and four technology levels. These options are rechargeable ...

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