Grúa

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

grúa

ð, to swarm; in the phrase, það úir af grúir af e-u, it swarms and crowds.

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