Red or yellow LEDs are used in indicator and alphanumeric displays in environments where night vision must be retained : aircraft cockpits, submarine and ship bridges, astronomy observatories, and in the field, e . g . night time animal watching and military field use.
22.
In computing, the "'USB human interface device class "'( "'USB HID class "') is a part of the USB specification for computer peripherals : it specifies a device class ( a type of computer hardware ) for human interface devices such as mice, game controllers and alphanumeric display devices.
23.
Some mobile radios have alphanumeric displays that translate channel numbers ( F1, F2 ) to a phrase more meaningful to the user, such as " Providence Base ", " Boston Base ", etc . Radios are now designed with a myriad of features to preclude the need for custom design.
24.
It is however possible as long as the namespace on both machines is maintained ( this can be done during merging of the indexes by making sure that academic page names assuming page name is the key index contain an automatic additional character such as * or some character outside the alphanumeric display range ).
25.
This was much more cryptic than the alphanumeric display of earlier models like the II / IID, III / IIID, IIP, and IIIP, as it was impossible to determine the meaning of the patterns of LEDs without comparing them against a manual ( or having their meaning memorized, which some technicians exposed to them often might actually do, intentionally or not ).
