Miss

[Jill Lundrigan]

When signing a letter for someone else and you write pp what does pp stand for.

[Hanka]

I think it means "per procura" which means "by proxy". So as you said, it means that you are signing something on behalf of someone else.

Hanka

[sheena55ro]

When signing a letter for someone else and you write pp what does pp stand for.

The following abbreviations are widely used in letters:

asap = as soon as possible
cc = carbon copy (when you send a copy of a letter to more than one person, you use this abbreviation to let them know)
enc. = enclosure (when you include other papers with your letter)
pp = per procurationem (A Latin phrase meaning that you are signing the letter on somebody else's behalf; if they are not there to sign it themselves, etc)
ps = postscript (when you want to add something after you've finished and signed it)
pto (informal) = please turn over (to make sure that the other person knows the letter continues on the other side of the page)
RSVP = please reply

[MrPedantic]

PS:

p.p. means "by the agency of"; so it goes before your name, if you are signing in someone else's absence, since you are the proxy.

Thus if Sheena is out of the office, and I sign a letter on her behalf, I put:

Yours sincerely

p.p. MrP

Sheena55ro

(People often mistakenly put the p.p. before the absent person's name.)

MrP