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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    Before PDF version 1.5, the table would always be in a special ASCII format, be marked with the xref keyword, and follow the main body composed of indirect objects. Version 1.5 introduced optional cross-reference streams, which have the form of a standard stream object, possibly with filters applied. Such a stream may be used instead of the ...

  3. History of PDF - Wikipedia

    en.wikipedia.org/wiki/History_of_PDF

    Documents containing Adobe extended features still carry the PDF base version number 1.7 but also contain an indication of which extension was followed during document creation. [21] PDF documents conforming to ISO 32000-2 carry the PDF version number 2.0, and are known to developers as "PDF 2.0 documents".

  4. Fictitious telephone number - Wikipedia

    en.wikipedia.org/wiki/Fictitious_telephone_number

    [11] [12] [13] In 1997, Brazilian singer and rapper Gabriel o Pensador released the single "2345meia78" from his album Quebra-Cabeça. The song tells the story of a man who decides to call all the women in his phonebook from a public phone. The song was in 11th place among the best Brazilian songs of 1997. [14]

  5. Cultural-historical activity theory - Wikipedia

    en.wikipedia.org/wiki/Cultural-historical...

    The term CHAT was coined by Michael Cole [11] and popularized by Yrjö Engeström [12] to promote the unity of what, by the 1990s, had become a variety of currents harking back to Vygotsky's work. [13] [14] Prominent among those currents are Cultural-historical psychology, in use since the 1930s, and Activity theory in use since the 1960s.

  6. 12/31/23 meaning: What numerology says about the last day of ...

    www.aol.com/news/12-31-23-meaning-numerology...

    Numerology is a practice that ascribes meaning to specific digits and series of digits. The last day of the year — Dec. 31, 2023 — is particularly intriguing, numerologically speaking.

  7. Thabit number - Wikipedia

    en.wikipedia.org/wiki/Thabit_number

    It is also searching for primes of the form 3·2 n +1, such primes are called Thabit primes of the second kind or 321 primes of the second kind. The first few Thabit numbers of the second kind are: 4, 7, 13, 25, 49, 97, 193, 385, 769, 1537, 3073, 6145, 12289, 24577, 49153, 98305, 196609, 393217, 786433, 1572865, ...

  8. List of British bingo nicknames - Wikipedia

    en.wikipedia.org/wiki/List_of_British_bingo...

    22 Ducks on the pond/Two little ducks The numeral 22 resembles the profile of two ducks. [7] Response is often "quack, quack, quack". 23 The Lord is My Shepherd The first words of Psalm 23 of the Old Testament. Lisa Scott-Lee: The chart position for her 2004 single Get It On, the subject of which has become an internet meme. Thee and me [3]

  9. Online chat - Wikipedia

    en.wikipedia.org/wiki/Online_chat

    Online chat may address point-to-point communications as well as multicast communications from one sender to many receivers and voice and video chat, or may be a feature of a web conferencing service. Online chat in a narrower sense is any kind of communication over the Internet that offers a real-time transmission of text messages from sender ...