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  2. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    Number systems have progressed from the use of fingers and tally marks, perhaps more than 40,000 years ago, to the use of sets of glyphs able to represent any conceivable number efficiently. The earliest known unambiguous notations for numbers emerged in Mesopotamia about 5000 or 6000 years ago.

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  4. Printer tracking dots - Wikipedia

    en.wikipedia.org/wiki/Printer_tracking_dots

    Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...

  5. Tracking number - Wikipedia

    en.wikipedia.org/wiki/Tracking_number

    It is a unique ID number or code assigned to a package or parcel. The tracking number is typically printed on the shipping label as a bar code that can be scanned by anyone with a bar code reader or smartphone. In the United States, some of the carriers using tracking numbers include UPS, [1] FedEx, [2] and the United States Postal Service. [3]

  6. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    Provides the directory number, date and time of unanswered calls. *52 1152 Call Hold (Single Line Variety Package). Permits the call to be picked up at another station. *53 1153 Distinctive Ring B. Allows a subscriber to alert a specific party distinctively. *54 1154 Distinctive Ring C. Allows a subscriber to alert a specific party ...

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