you name it whatever it most closely resembles to avoid inventing new terms that no one knows. In some cases it may be clear that a combined name is a good idea and maybe makes for a fine trademark. Ultimately no one will buy just based on the name but by actually seeing the contraption and understanding what it's limits and benefits are (obviously not all do well at that but that has little to do with how something is named).
PFD's (Life Jackets)
|Table of Contents|