In the field of Computer Science PIO stands for Programmed Input/Output..
In the field of Computer Science PGA stands for Pin Grid Array..
In the field of Computer Science PHP stands for PHP.
In the field of Computer Science PIC stands for Peripheral Interface Controller / Programmable Interrupt Controller..
In the field of Computer Science OOP stands for Object-Oriented Programming..
In the field of Computer Science OPML stands for Outline Processor Markup Language..
In the field of Computer Science OS stands for Operating System..
In the field of Computer Science OSS stands for Open Source Software..
In the field of Computer Science OCR stands for Optical Character Reader..
In the field of Computer Science PCIe stands for PCI Express..