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  2. PDF417 - Wikipedia

    en.wikipedia.org/wiki/PDF417

    PDF417 is a stacked linear barcode format used in a variety of applications such as transport, identification cards, and inventory management. "PDF" stands for Portable Data File. The "417" signifies that each pattern in the code consists of 4 bars and spaces in a pattern that is 17 units (modules) long.

  3. Four-bar linkage - Wikipedia

    en.wikipedia.org/wiki/Four-bar_linkage

    It consists of four bodies, called bars or links, connected in a loop by four joints. Generally, the joints are configured so the links move in parallel planes, and the assembly is called a planar four-bar linkage. Spherical and spatial four-bar linkages also exist and are used in practice. [1] A pumpjack's main mechanism is a four-bar linkage

  4. Common Access Card - Wikipedia

    en.wikipedia.org/wiki/Common_Access_Card

    A blue bar across the holder’s name shows that the cardholder is a non-U.S. citizen. A green bar shows that the cardholder is a contractor. Absence of a bar indicates all other personnel—including military personnel and civil workers, among others. The back of the card has a ghost image of the cardholder.

  5. Wason selection task - Wikipedia

    en.wikipedia.org/wiki/Wason_selection_task

    Which card or cards must be turned over to test the idea that if a card shows an even number on one face, then its opposite face is blue? The Wason selection task (or four-card problem) is a logic puzzle devised by Peter Cathcart Wason in 1966. [1] [2] [3] It is one of the most famous tasks in the study of deductive reasoning. [4]

  6. Glossary of contract bridge terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_contract...

    Conventionally neither 4333 nor 4–3–3–3 indicates which is the four-card suit in a hand while 4=3=3=3 means four spades, represented first, and three each in hearts, diamonds, and clubs. Thus 4=6=2=1 means 4 spades, 6 hearts, 2 diamonds, and 1 club. Distribution points A measure of one hand's strength due to the length or shortness of suits.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Pub game - Wikipedia

    en.wikipedia.org/wiki/Pub_game

    2.4.2 Bar billiards. 2.5 Bat and ball games. ... The ball is on a short plinth about 4 inches (10 cm) high, and is known as a 'dolly'. ... Numerous card games have ...

  9. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    4 bar heights: Royal Mail RM Mailmark L: Discrete: 4 bar heights: Royal Mail Spotify codes: Discrete: 23 bar heights: Spotify codes point to artists, songs, podcasts, playlists, and albums. The information is encoded in the height of the bars; [43] so as long as the bar heights are maintained, the code can be handwritten and can vary in color. [44]