Snake casing is often used as a variable naming convention. The following names are in snake case: left_shift , bitwise_invert , matrix_transpose .

Note that snake case never contains upper case letters. Sometimes, constants are written in all-uppercase, such as JavaScript's Number.MAX_SAFE_INTEGER . This is not typically considered as snake case. Instead, it is sometimes called screaming snake case .

Snake case is the most popular convention in Python, Rust, and various other languages.