Arvāvasu (Arvavasu) is the name of a special Saurakiraṇa (Saurakirana; solar ray); it is one of the seven major rays of the sun. This adds glow to Vṛhaspati (Vrihaspati). In Vāyupurāṇa (Vayupurana), Arvāvasu (Arvavasu) is mentioned as Arvāgvasu (Arvavasu).