(1) An alternate name used for identification, such as for naming a field or a file. See CNAME record.

(2) In the Mac, an alias is an icon that points to a program or data file. Aliases can be placed on the desktop or stored in other folders, and double clicking the alias is the same as double clicking the original file's icon. However, deleting an alias does not remove the original file. In Windows, an alias is called a "shortcut."

(3) In Unix/Linux, an alias is a command that points to another command. It is typically used to abbreviate complex commands that are used repeatedly. Unless saved, aliases last only for the current session.

(4) A phony signal created under certain conditions when digitizing voice.