A zero (used in reading out numbers).
Operator
The name of the Latin-script letter O/o.
Object, see SVO
The fifteenth letter of the English alphabet, called o and written in the Latin script.
Over
To use a teletype.
An early input/output device for mainframe computers.
The telegrams produced by this device.
A telegraph that automatically prints transmited messages in letters rather than Morse code or other symbols, typically resembling a typewriter in appearance.