Proofreading Service - Pain in the English
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guillaume.salagnac

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October 6, 2009

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p. v. pp.

  • October 6, 2009, 9:46am

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).