To quote TIOBE, "The TIOBE Programming Community index is an indicator of the popularity of programming languages. The index is updated once a month. The ratings are based on the number of skilled engineers world-wide, courses and third party vendors." We don't use the term Realbasic often, but it is important to realize that it is the name of Real Studio's programming language. If you're writing about the programming language, try to use Realbasic to describe it.
A special thank you to Kevin Cully, founder of the Real Studio Atlanta Group, for pointing out Realbasic's rise in the April Index.