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Comment by liotier | Hacker News Reader

I just connected the dots... The identifier digits in the Dewey Decimal classification are called "call numbers" !

Yes, that's in the second paragraph of the article.

I took this to be a pun on "decimal" and "connecting the dots" but perhaps I'm just wired to see puns where they weren't necessarily intended.

  > I'm just wired to see puns where they weren't necessarily intended.

I guess it keeps you grounded. Shocking how that works.