Syrta

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

syrta

t, [sorti], to grow dark; það syrtir að.

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