Rúmbrugðinn

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

rúmbrugðinn

pp. very large (~ hverr).

Possible runic inscription in Younger Futhark:ᚱᚢᛘᛒᚱᚢᚴᚦᛁᚾᚾ