double cardan

I have a 1997 TJ with a Currie Enterprises Transfer Case Conversion Kit CE-9069T and what seems to be a Rubicon Express yoke adapter and driveshaft (RE1807). I am not the original owner so I am digging all around trying to find a rear seal for the Tail end of my transfer case. I am not sure the...

Tore down the double cardan joint on my front driveshaft to rebuild it. Unfortunately it looks like I need a new driveshaft… The shaft is badly worn. You can easily feel all of the visible marks. The centering yoke has a small amount of play in the ball and socket joint. The retaining ring...

I'm not sure if the title explains what I am trying to figure out, but why is it that a double cardan driveshaft is sometimes referred to as a 'CV' driveshaft? I was under the impression that a CV driveshaft was similar to the type of CV joint found on say an RCV axle or most modern day...