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  2. International Code of Signals - Wikipedia

    en.wikipedia.org/wiki/International_Code_of_Signals

    The International Code of Signals (INTERCO) is an international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters. Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. The International Code is the most ...

  3. International maritime signal flags - Wikipedia

    en.wikipedia.org/wiki/International_maritime...

    International maritime signal flags. International maritime signal flags are various flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals. [1] Various navies have flag systems with additional flags and codes, and other flags are used in special uses, or have historical ...

  4. Root-raised-cosine filter - Wikipedia

    en.wikipedia.org/wiki/Root-raised-cosine_filter

    The impulse response of a root-raised cosine filter multiplied by T s, for three values of β: 1.0 (blue), 0.5 (red) and 0 (green).. The RRC filter is characterised by two values; β, the roll-off factor, and T s the reciprocal of the symbol-rate.

  5. Raised-cosine filter - Wikipedia

    en.wikipedia.org/wiki/Raised-cosine_filter

    Mathematical description. The raised-cosine filter is an implementation of a low-pass Nyquist filter, i.e., one that has the property of vestigial symmetry. This means that its spectrum exhibits odd symmetry about , where is the symbol-period of the communications system. Its frequency-domain description is a piecewise -defined function, given ...

  6. Police code - Wikipedia

    en.wikipedia.org/wiki/Police_code

    Police code. A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or ...

  7. Slave codes - Wikipedia

    en.wikipedia.org/wiki/Slave_codes

    The slave codes were laws relating to slavery and enslaved people, specifically regarding the Atlantic slave trade and chattel slavery in the Americas. Most slave codes were concerned with the rights and duties of free people in regards to enslaved people. Slave codes left a great deal unsaid, with much of the actual practice of slavery being a ...

  8. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    For example, in the NYPD system, Code 10-13 means "Officer needs help," whereas in the APCO system "Officer needs help" is Code 10-33. The New Zealand reality television show Ten 7 Aotearoa (formerly Police Ten 7) takes its name from the New Zealand Police ten-code 10-7, which means "Unit has arrived at job". [citation needed]

  9. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Coupon. In marketing, a coupon is a ticket or document that can be redeemed for a financial discount or rebate when purchasing a product. Customarily, coupons are issued by manufacturers of consumer packaged goods [1] or by retailers, to be used in retail stores as a part of sales promotions. They are often widely distributed through mail ...

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