An RV is a van which is equipped with such things as beds and cooking equipment, so that people can live in it, usually while they are on holiday. RV is an abbreviation for 'recreational vehicle'. (mainly AM; in BRIT, usually use camper , camper van )
...a group of RVs pulled over on the side of the highway.
RV Tauri (RV Tau) is a star in the constellation Taurus. It is a yellow supergiant and is the prototype of a class of pulsating variables known as RV Tauri variables. It is a post-AGB star and a spectroscopic binary about 4,700 light years away.