Answer: ppps

AnswerCrossword Clue
PPPS

Third afterthought, in a ltr.

PPPS

Long letter extender

PPPS

Musical directions meaning "very soft."

PPPS
Pianissimo marks.
PPPS
Directions in music.
PPPSThird addendum to a letter
PPPSThird afterthought in a letter: Abbr.
PPPSThird line at the bottom: Abbr.
PPPSThird afterthought in a missive: Abbr.
PPPSThought after an after-afterthought: Abbr.
PPPSThird afterthought abbr.