The terms foobar (/ˈfuːbɑːr/), or foo and others are used as placeholder names (also referred to as metasyntactic variables) in computer programming or computer-related documentation. They have been used to name entities such as variables, functions, and commands whose exact identity is unimportant and serve only to demonstrate a concept. The etymology of foo is obscure. Its use in connection with bar is generally traced to the World War II military slang FUBAR, later bowdlerised to foobar. The...