PCI eXtensions for Instrumentation
PCI eXtensions for Instrumentation (PXI) is one of several modular electronic instrumentation platforms in current use based on the Peripheral Component Interconnect bus, which includes PCI Express (PCIe). These platforms are used as a basis for building electronic test equipment, automation systems, and modular laboratory instruments.
Source: Wikipedia — PCI eXtensions for Instrumentation (CC BY-SA 4.0)