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  2. Presidential lecterns of the United States - Wikipedia

    en.wikipedia.org/wiki/Presidential_lecterns_of...

    Its downsized counterpart, the Falcon, is used for travel purposes, and the Toast lectern is the smallest version, used for informal events. The White House Communications Agency (WHCA) presides over many Blue Goose and Falcon lecterns, [ 1 ] [ 2 ] building them and sending teams to set up the lecterns at all events where the President, Vice ...

  3. Aeronautical chart conventions (United States) - Wikipedia

    en.wikipedia.org/wiki/Aeronautical_chart...

    The size of each sectional is designed to be "arm's width" when completely unfolded. The "northern" half of the section is on one side of the chart, and the "southern" on the reverse. The edges between north and south are designed with a calibrated overlap that permits plotting extensions of course lines from one side to the other, once the ...

  4. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    CAD: computer-aided design, computer-aided drafting; cadmium [plating]: CAGE: Commercial and Government Entity [code]: A CAGE code is a unique identifier to label an entity (that is, a specific government agency or corporation at a specific site) that is a CDA, ODA, or MFR of the part defined by the drawing.

  5. Radical symbol - Wikipedia

    en.wikipedia.org/wiki/Radical_symbol

    The two square roots of a negative number are both imaginary numbers, and the square root symbol refers to the principal square root, the one with a positive imaginary part. For the definition of the principal square root of other complex numbers, see Square root § Principal square root of a complex number.

  6. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    The following table lists many specialized symbols commonly used in modern mathematics, ... radical symbol (for square root) 1637 (with the vinculum above the radicand)

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    If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online!