Light under tail light in on 1995 Cadillac Eldorado?

http://www.google.com/imgres?q=cadillac+eldorado+1995+bck&um=1&hl=en&safe=off&sa=N&rlz=1C1CHKZ_enUS432US432&tbm=isch&tbnid=ZNLdio0omO2tnM:&imgrefurl=http://www.salvage-cars-for-sale.info/used/cadillac/eldorado/for-sale/page-56/&docid=QDHRfQpzUILKvM&w=640&h=480&ei=7tUsTt-rH6rc0QH9i83kDg&zoom=1&iact=rc&dur=352&page=1&tbnh=126&tbnw=181&start=0&ndsp=24&ved=1t:429,r:22,s:0&tx=52&ty=96&biw=1366&bih=677
I know it's not an actual light, whats the technical name for it? thanks

psssh…you call that a car