Noun
VDU (plural VDUs)
Initialism of visual display unit.
The teleprinter includes a keyboard, which is the main means of entering text, and a printer or visual display unit (VDU). Source: Internet
When a sequence of start bit, 5 data bits and stop bit arrives at the input of the teleprinter, it is converted to a 5-bit word and passed to the printer or VDU. Source: Internet