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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://noc.social/users/todayilearned/statuses/113104438392634619">Today I learned (todayilearned@noc.social)'s status on Monday, 09-Sep-2024 08:07:25 JST</a><a href="https://noc.social/@todayilearned" title="todayilearned@noc.social"><img src="https://gnusocial.jp/avatar/45561-48-20240526153207.webp" width="48" height="48" alt="Today I learned" style="position: absolute; left: 0; top: 0;">Today I learned</a></section><article><p>TIL the Dewey Decimal system reserves 999 for history of "extraterrestrial worlds"</p><p><a href="https://en.wikipedia.org/wiki/List_of_Dewey_Decimal_classes" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/List_of_Dewey_Decimal_classes</a><br><a href="https://noc.social/tags/til" rel="tag">#til</a> <a href="https://noc.social/tags/todayilearned" rel="tag">#todayilearned</a><br><a href="https://www.reddit.com/r/todayilearned/comments/1fcao0k/til_the_dewey_decimal_system_reserves_999_for/" rel="nofollow noreferrer">https://www.reddit.com/r/todayilearned/comments/1fcao0k/til_the_dewey_decimal_system_reserves_999_for/</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/3635878#notice-7126810">In conversation</a><time datetime="2024-09-09T08:07:25+09:00" title="Monday, 09-Sep-2024 08:07:25 JST">about 3 months ago</time> <span>from <span><a href="https://noc.social/@todayilearned/113104438392634619" rel="external" title="Sent from noc.social via ActivityPub">noc.social</a></span></span><a href="https://noc.social/@todayilearned/113104438392634619">permalink</a><h4>Attachments</h4><ol><li><article><header><div>No result found on File_thumbnail lookup.</div><h5><a href="https://en.wikipedia.org/wiki/List_of_Dewey_Decimal_classes">List of Dewey Decimal classes</a></h5><div></div></header><div>The Dewey Decimal Classification (DDC) is structured around ten main classes covering the entire world of knowledge; each main class is further structured into ten hierarchical divisions, each having ten divisions of increasing specificity.  As a system of library classification the DDC is "arranged by discipline, not subject", so a topic like clothing is classed based on its disciplinary treatment (psychological influence of clothing at 155.95, customs associated with clothing at 391, and fashion design of clothing at 746.92) within the conceptual framework. The list below presents the ten main classes, hundred divisions, and thousand sections.Class 000 – Computer science, information, and general works
000 Computer science, knowledge, and systems
000 Computer science, information and general works
001 Knowledge
002 The book (writing, libraries, and book-related topics)
003 Systems
004 Data processing and computer science
005 Computer programming...</div><footer></footer></article></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/3142476">Untitled attachment</a></label><br></li></ol></footer></blockquote>

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Today I learned (todayilearned@noc.social)'s status on Monday, 09-Sep-2024 08:07:25 JST Today I learned
TIL the Dewey Decimal system reserves 999 for history of "extraterrestrial worlds"
https://en.wikipedia.org/wiki/List_of_Dewey_Decimal_classes
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1fcao0k/til_the_dewey_decimal_system_reserves_999_for/
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  List of Dewey Decimal classes
  The Dewey Decimal Classification (DDC) is structured around ten main classes covering the entire world of knowledge; each main class is further structured into ten hierarchical divisions, each having ten divisions of increasing specificity. As a system of library classification the DDC is "arranged by discipline, not subject", so a topic like clothing is classed based on its disciplinary treatment (psychological influence of clothing at 155.95, customs associated with clothing at 391, and fashion design of clothing at 746.92) within the conceptual framework. The list below presents the ten main classes, hundred divisions, and thousand sections. Class 000 – Computer science, information, and general works 000 Computer science, knowledge, and systems 000 Computer science, information and general works 001 Knowledge 002 The book (writing, libraries, and book-related topics) 003 Systems 004 Data processing and computer science 005 Computer programming...
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