Which of the following is not an example of a programming language that uses Unicode?

Fortran is the correct choice because it is historically known for its association with older character sets, primarily ASCII, which was prevalent before Unicode became widely adopted. While modern versions of Fortran may have some support for Unicode, it is not inherently designed to work with it as seamlessly as the other languages listed.

Java, C++, and Python all embrace Unicode to a significant extent. Java inherently uses UTF-16 encoding for strings, allowing for international character representation. C++ can utilize Unicode through libraries and modern practices, specifically with wide characters and the standard library's support for UTF-8. Python, especially versions 3.x and onward, uses Unicode by default for its string representation, making internationalization straightforward.

In contrast, Fortran's legacy primarily rests with fixed-format source code that did not accommodate the complexities of Unicode, thereby making it less adaptable in this context compared to the others mentioned.