What is the back seat of a convertible car called?

<br>Do you mean a <a href="http://dig.ccmixter.org/search?searchp=rumble%20seat">rumble seat</a>? That is a seat that folds out of the rear chassis of <a href="https://jetblacktransportation.com/blog/car-service-to-lga-from-nj/">JetBlack</a>; a car.<img src="https://www.freepixels.com/class="; style="max-width:420px;float:right;padding:10px 0px 10px 10px;border:0px;" alt="" /> <br>