HEIMDAL, or HEIMDALL  , in Scandinavian mythology, the keeper of the gates of Heaven and the guardian of the rainbow bridge Bifrost . He is the son of Odin by nine virgins, all sisters . He is called " the god with the golden teeth." He lives in the stronghold of Himinsbiorg at the end of Bifrost . His chief attribute is a vigilance which nothing can escape . He sleeps less than a bird; sees at night and even in his sleep; can hear the grass, and even the wool on a lamb's back grow . He is armed with Gjallar, the magic horn, with which he will summon the gods on the day of judgment .