Gýll

As defined by the Cleasby & Vigfusson Old Norse to English dictionary:

gýll

m., or perhaps gíll, [gill, Ivar Aasen, akin to gjöll], a mock sun, parhelion, Scot. gow, conceived to be a wolf preceding the sun: when the sun is surrounded by mock suns he is said to be in ‘wolf-stress,’ úlfa-kreppa; the phenomenon is called gýla-ferð, f. ‘wolf-gang;’ cp. also the saying, sjaldan er gýll fyrir góðu nema úlfr eptir renni, a gill bodes no good unless followed by a wolf (a sign of weather), Ísl. Þjóðs. i. 658, 659.

Possible runic inscription in Younger Futhark:ᚴᚢᛚᛚ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements