stereochemistry (stÄr'Ä-Å-kÄm'Ä­-strÄ) The branch of chemistry that deals with the spatial arrangements of atoms in molecules and with the chemical and physical effects of these arrangements.
ECU. Short for Electronic Control Unit, the ECU is a name given to a device that controls one or more electrical systems in a vehicle. It operates much like the BIOS does in a computer.
RTU (Remote Terminal Unit) and PLC (Programmable Logic Controller) devices located at remote field sites, as well as other subordinate servers typically act as slaves. Is the master or heart of an ICS and typically located at the operator's central control facility.