A water-insoluble alcohol that occurs in plant oils (especially wheat germ oil), egg yolks, and liver, and is also produced synthetically. Alpha-tocopherol is the principal form of vitamin E in the body. Chemical formula: C 29 H 50 O 2. See more at vitamin E.
âInputâ is also easy-something put into a system. So in the technology world... An input device is any tool that feeds data into a computer. For example, a keyboard is an input device, whereas a display monitor is an output device. Mice, trackballs, and light pens are all input devices.
Devices you think of as input-only, such as a keyboard, might also be an output device (keyboard status LEDs). Conversely, devices you think of as output-only might also serve as input devices (paper/toner/ink status messages back to the computer).