pp

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1) pp is written before a person's name at the bottom of a formal or business letter in order to indicate that they have signed the letter on behalf of the person whose name appears before theirs.

...J.R. Adams, pp D. Philips.

2) pp. is the plural of `p.' and means `pages'. [WRITTEN]

See chapter 6, pp. 137-41.

3) In a piece of music, pp is a written abbreviation for pianissimo.