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"pp" is an abbreviation that can have multiple meanings, such as "pages", "per person", or "parts per million". It is often used in written or spoken communication as a shorthand for these phrases.
In written communication, "pp" is commonly used as a way to indicate the number of pages in a document or book. For example, "Please turn to pp. 23-25 for the next chapter." It can also be used to indicate the number of copies to be printed, as in "Please print 5 copies of this document."
In scientific or technical contexts, "pp" is often used as an abbreviation for "parts per million". This is a unit of measurement commonly used to express small concentrations of substances in a mixture.
"pp" is considered an abbreviation, rather than an acronym, because it is pronounced as individual letters (i.e. "pee-pee") rather than as a word (like "NASA" or "scuba"). However, it can also be considered an initialism, which is a type of abbreviation where each letter is pronounced separately.
Aside from the previously mentioned uses, "pp" can also stand for "per person" in contexts such as travel or event planning, or "passing percentage" in academic grading systems. It can also be used as a slang term for "power play" in sports, or "pre-production" in film or television. The meaning of "pp" can vary depending on the context it is used in.