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Specifically Numbered Group

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Kid Flash: Wait, wait, wait, wait. If you’re called the “Hive Five”, how come there is six of you?
See-More: C-Cause... I-it sounds cooler?

Sometimes, an organization, group or gang needs specific rules. Like how many members it can have. It’s fairly routine with evil organizations, though it may appear with heroic groups as well.

This is a case when the number of the group is defined and, apparently, immutable. There are times when a justification is given during the course of the story, but other times there is no explanation whatsoever, except that it sounds better.


Please: When adding examples in the “justified” category, do state the explanation given in series.


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    Anime and Manga 

  • Of all schools shown in the Harry Potter series, Hogwarts is the only one whose students are divided into four Houses, created by the four founders.
  • In The Elenium, the Styric Pantheon is aptly known as The Thousand, or, literally, "ten times ten times ten", which they picked because it was an auspiciously round number. One god who'd lost a finger had wanted it to be the "nine times nine times nine", but more deities than that had already come into existence.
  • In the Dreamblood Duology, the Prince of Gujaareh has an Exotic Extended Marriage of 256 wives: the goddess Hananja is associated with the number four, so 256 (four times four times four times four) is especially holy, as is the Prince as Hananja's Avatar.

    Video Games 
  • The Organization XIII of Kingdom Hearts series. The story is that Xehanort wants recreate the 13 incarnations of darkness by using them.

    Real Life 
  • A large number of governmental bodies always have exactly X number of members (e.g.: the U.S. Supreme Court always has nine members, unless there's a vacancy). There are far too many of these to list them all, but it's safe to say that for any given such body, the reason that it is always exactly X number is usually "It's convenient."
  • Historically, a jury (in common-law countries, at any rate) always had twelve members (with the exception of Scotland, where the number was 15), with the historical justifications ranging from the numerological to the lazy. Modern juries are an aversion: many jurisdictions call for smaller juries in criminal trials, and even the most conservative (like the American federal court system, which insists on the old-fashioned twelve-person jury for criminal cases) allow for the parties to agree on a smaller jury in civil cases.

Not Explained

    Anime and Manga 

Example of: