PS

PS is an abbreviation, most commonly used to indicate a postscript, 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".

Depending on the context, PS might also stand for:

• Pferdestärke -- German for horsepower
• Proton Synchrotron
• PostScript, page description language for computers
• Political science
• The resin identification code for Polystyrene
• Various socialist political parties - Partido Socialista (Portugal) and Parti Socialiste (France, Belgium)
• PlayStation
• Public school in the United States, often as part of the number of an unnamed school, such as P.S. 31.