Las banderas de la Torre de la Vela

En una tarde de viento así se muestran los colores de las cuatro banderas que coronan la Torre de la Vela. I was wondering myself whether this Torre de la Vela, at Alhambra, either refers to "candle" or "sail", because "vela" in Spanish has both meanings: maybe somebody of the visitors to this blog could ascertain and answer probably. The flags are the ones of Europe, Andalusia, Spain, and Granada.