UART
Acronym for universal asynchronous receiver-transmitter. A module composed of a single integrated circuit that contains both the receiving and transmitting circuits required for asynchronous serial communication.
Unimodem
Name used to refer to the Windows universal modem driver. It is a driver-level component that uses modem description files (INFs) to control its interaction with the communications driver.
Universal Serial Bus
A bidirectional, isochronous, dynamically attachable serial interface for adding peripheral devices such as game controllers, serial and parallel ports, and input devices on a single bus.
USB
Acronym for Universal Serial Bus.