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  2. Airline ticket - Wikipedia

    en.wikipedia.org/wiki/Airline_ticket

    The airline ticket may be one of two types: a paper ticket, which comprises coupons or vouchers; and an electronic ticket (commonly referred to as an e-ticket ). The ticket, in either form, is required to obtain a boarding pass during check-in at the airport. Then with the boarding pass and the attached ticket, the passenger is allowed to board ...

  3. Closed-circuit television - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television

    Surveillance cameras on the corner of a building. Surveillance camera in a residential community. Dome camera in Rotterdam central metro station. Closed-circuit television ( CCTV ), also known as video surveillance, [1] [2] is the use of closed-circuit television cameras to transmit a signal to a specific place, on a limited set of monitors.

  4. History of the camera - Wikipedia

    en.wikipedia.org/wiki/History_of_the_camera

    In 1991, Kodak brought to market the Kodak DCS (Kodak Digital Camera System), the beginning of a long line of professional Kodak DCS SLR cameras that were based in part on film bodies, often Nikons. The Kodak DCS was the first commercially available Digital SLR (DSLR) It used a 1.3 megapixel sensor, had a bulky external digital storage system ...

  5. 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 ...

  6. Level crossings by country - Wikipedia

    en.wikipedia.org/wiki/Level_crossings_by_country

    Most crossings has stop signs with a stop line sign (both Kazakh and English), and it uses the crossing detector system to fully block traffic to prevent that the trains are approaching. Some crossings also has a camera mounted above the tracks by protecting the security from the crossing to watch the traffic such as accidents or breaking the ...

  7. Camera - Wikipedia

    en.wikipedia.org/wiki/Camera

    Camera. Leica camera (1950s) Hasselblad 500 C/M with Zeiss lens. A camera is an instrument used to capture and store images and videos, either digitally via an electronic image sensor, or chemically via a light-sensitive material such as photographic film. As a pivotal technology in the fields of photography and videography, cameras have played ...

  8. One-time pad - Wikipedia

    en.wikipedia.org/wiki/One-time_pad

    One-time pad. A format of one-time pad used by the U.S. National Security Agency, code named DIANA. The table on the right is an aid for converting between plaintext and ciphertext using the characters at left as the key. In cryptography, the one-time pad ( OTP) is an encryption technique that cannot be cracked, but requires the use of a single ...

  9. List of camera types - Wikipedia

    en.wikipedia.org/wiki/List_of_camera_types

    Light-field camera. Live-preview digital camera. Medium format camera. Mirrorless interchangeable-lens camera. Monorail camera. Movie camera. Multiplane camera. Omnidirectional camera. Onboard camera.

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