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guillaume.salagnac
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Unpacking English, Bit by Bit
A community for questioning, nitpicking, and debating the quirks and rules of the English language.
p. v. pp.
Quoting Wikipedia:
http://en.wikipedia.org/wiki/Abbreviation
In Latin, and continuing to the derivative forms in European languages as well as English, single-letter abbreviations had the plural being a doubling of the letter for note-taking. Most of these deal with writing and publishing.
The rest of the wp article discusses the use of the final period as well (cf "History" section).