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  2. Trap and trace device - Wikipedia

    en.wikipedia.org/wiki/Trap_and_trace_device

    A trap and trace device shows what numbers had called a specific telephone —i.e., all incoming phone numbers. A pen register rather would show what numbers a phone had called, i.e. all outgoing phone numbers. The two terms are often used in concert, especially in the context of Internet communications. They are often jointly referred to as ...

  3. Pen register - Wikipedia

    en.wikipedia.org/wiki/Pen_register

    A device which records or decodes electronic or other impulses which identify the numbers called or otherwise transmitted on the telephone line to which such device is dedicated. A pen register is similar to a trap and trace device. A trap and trace device would show what numbers had called a specific telephone, i.e., all incoming phone numbers.

  4. CodePen - Wikipedia

    en.wikipedia.org/wiki/CodePen

    CodePen is an online community for testing and showcasing user-created HTML, CSS and JavaScript code snippets. It functions as an online code editor and open-source learning environment, where developers can create code snippets, called "pens," and test them. It was founded in 2012 by full-stack developers Alex Vazquez and Tim Sabat and front ...

  5. Private Enterprise Number - Wikipedia

    en.wikipedia.org/wiki/Private_enterprise_number

    Private Enterprise Numbers ( PENs) are created and maintained by the Internet Assigned Numbers Authority ( IANA) in a public registry. The registry includes the name of the assignee, a publicly-displayed email address, and a "contact name." Any organization or individual may request, at no cost, a Private Enterprise Number (PEN) assignment.

  6. Barcode reader - Wikipedia

    en.wikipedia.org/wiki/Barcode_reader

    Barcode reader. A stationary barcode scanner for a conveyor line. A barcode reader or barcode scanner is an optical scanner that can read printed barcodes and send the data they contain to computer. [1] Like a flatbed scanner, it consists of a light source, a lens, and a light sensor for translating optical impulses into electrical signals.

  7. Recycling codes - Wikipedia

    en.wikipedia.org/wiki/Recycling_codes

    Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process. The presence on an item of a recycling code, a chasing arrows logo, or a resin code , is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.

  8. Printing telegraph - Wikipedia

    en.wikipedia.org/wiki/Printing_telegraph

    The printing telegraph was invented by Royal Earl House in 1846. House's telegraph could transmit around 40 instantly readable words per minute, but was difficult to manufacture in bulk. The printer could copy and print out up to 2,000 words per hour. This invention was first put in operation and exhibited at the Mechanics Institute in New York.

  9. WDR paper computer - Wikipedia

    en.wikipedia.org/wiki/WDR_paper_computer

    The code from the photo above running in an emulator, adding the numbers 4 and 5. After 19 program steps, the end result 9 is in register 1. SVG template. The WDR paper computer or Know-how Computer is an educational model of a computer consisting only of a pen, a sheet of paper, and individual matches in the most simple case.