What Does Bar Mean?
Bar is a commonly used placeholder often used to name variables or other code elements. Arbitrary naming conventions such as this are known as metasyntactic variables.
Techopedia Explains Bar
The use of bar as a placeholder is derived from the use of another such placeholder: foo. Foo is one of the earliest popular placeholders used in technology. For example, foo is used to name generic variables in a learning environment. As developers continued to use foo, some began using bar as a second placeholder, partially because of the military term fubar, which has a different meaning and connotation.
