PS comes from the latin Post Scriptum , that means after writed it is a couple notes is like i write a text and on the end and adicional note Ps: you can visit this site about the text i wrote abouve XXX understand?
Exkuze me, all you guys are wrong!! It's 'Priority Substances,' 'per second,' 'Protection Stock,' 'Power Steering.' http://www.google.com/search?q=define:ps
Pen spinning - "a recreational activity of using one's fingers to manipulate a pen in aesthetically pleasing ways" (wikipedia )
Apparently one of the meanings is: Go ahead and mess around with the text box, if it makes you feel better. diabloblanco666.tripod.com/scienceterms.html