optical character reading
optical character recognition
optical communication
optical communications
optical computer
optical digital disc
optical disc
optical disk storage
optical drive
optical encoder
optical fiber
optical fiber cable
optical isolation
optical isolator
optical mark reader
optical mark reading
optical mark recognition
optical mask
optical memory
optical mode
optical mouse
optical processing
optical reader
optical recognition
optical recognition device
optical scanner
optical scanning
optical storage
opticals
optics
optimization
optimize
optimizer
optimizing compiler
optimum programming
option
optoelectronic elements
optoelectronics
optoelectronics scanner
optoisolator
optomechanical mouse
optotronics
OR
ordinal number
ordinate
orientation
oscilloscope
OSI
out of service
outdated
output
overflow
overload
overstrike
overtype
overwrite
ownership