pp

Adverb

 * 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.

Etymology
Abbreviations.

Noun

 * 1)  proton and proton (used attributively to describe a collision or other interaction of these two particles)
 * 1)  proton and proton (used attributively to describe a collision or other interaction of these two particles)
 * 1)  proton and proton (used attributively to describe a collision or other interaction of these two particles)

Related terms

 * ppbar