Okay. Not universally accepted term. How about, most of the people I know, use the term "posi" to describe a limited slip rear end.
When the Mustang was first introduced, it brought about the description of "pony car." Later, when GM started selling Camaro, it too was referred to as a pony car. Is this correct? I don't know. As long as we can communicate what we are talking about so people can understand, that's all that really matters. Words and phrases become generic all the time, even though they may have orginally been used to describe a specific thing. Many people don't really know an Equa-Lok from a Trac-Lok. But they know what a posi is.
65 FB "J" 302 lots of mods. 94 GT K&N only.
http://albums.photopoint.com/j/view?u=1590489&a=12113030&p=43871256&Sequence=7&res=high.jpg