Film Term:
Sometimes called a Self-Blimped Camera. The term is used not to mean a camera in a blimp, but a camera that is designed with internal soundproofing without the need for an external blimp. For instance, with an Arri BL the “BL” stands for “blimped.”
Glossary of Film Terms - http://homepage.newschool.edu/~schlemoj/film_courses/glossary_of_film_terms/
reprinted with permission