π. P.C.

...δηλαδή "προ perosnal computer".

http://www.dkaravasilis.gr/2010/12/%ce%b1%ce%bb%ce%bb%ce%bf-%ce%bb%ce%b5%ce%be%ce%b9%ce%bb%cf%8c%ce%b3%ce%b9%ce%bf-%cf%80%cf%81%ce%b9%ce%bd-%cf%84%ce%bf%cf%85%cf%82-%cf%85%cf%80%ce%bf%ce%bb%ce%bf%ce%b3%ce%b9%cf%83%cf%84%ce%ad%cf%82/