Main Page | See live article | Alphabetical index PS PS or ps may stand for: postscript (most commonly), a portion of a letter labelled P.S. added after the main body of the letter was written. It stands for post scriptum, a Latin expression meaning "after writing". Parti socialiste or Partido Socialista (Socialist Party) Pferdestärke -- German for horsepower PlayStation Political science polystyrene, the resin identification code PostScript, page description language for computers Proton Synchrotron Public school in the United States, often as part of the number of an unnamed school, such as P.S. 31. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.