pp

pp

1. pianissimo
2. per procurationem - Latin for by agency or by proxy - used on a letter to indicate that has been signed on somebody else's behalf.

• (pages): pp.
• (percentage point): %p (non standard)

pp pl (plural only)

1. plural of p; abbreviation of pages

pp (countable and uncountable, plural pps)

1. (countable) Initialism of percentage point.
2. (uncountable, physics) proton and proton (used attributively to describe a collision or other interaction of these two particles)
   • 2015, Christine O. Rasmussen, Torbjörn Sjöstrand, “Hard Diffraction with Dynamic Gap Survival”, in arXiv‎:

     Comparisons with ppbar and pp data reveal improvement in the description of single diffractive events..

• ppbar