| Subject | English | Polish |
| radiol. | four-pi 4 π counter | licznik 4π |
| auto.ctrl. | PI element | element PI |
| auto.ctrl. | PI element | człon proporcjonalno-całkujący |
| phys.sc., engl. | pi-meson | pion |
| phys.sc. | pi-meson | mezon π |
| comp., MS | Web PI | Instalator platformy sieci Web (A wizard that automates the installation of several commonly used Web technologies from a single installation point. These technologies include all the IIS features like ASP and ASP.NET, as well as Application Request Routing (ARR), Visual Web Developer Express, SQL Server Express, etc) |