Hörgr

A hörgr (Old Norse, pl. hörgar) or hearg (Old English, pl.  heargas) is a type of altar or cult site, possibly consisting of a heap of stones, used in Norse religion, as opposed to a roofed hall used as a hof (temple).

The Old Norse term is attested in both the Poetic Edda and the Prose Edda, in the sagas of Icelanders, skaldic poetry, and with its Old English cognate in Beowulf. The word is also reflected in various place names (in English placenames as harrow), often in connection with Germanic deities.