Þakiðr

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

þakiðr

pp. from þekja; kunna mjöt þakinna næfra, to know how many bark-flakes to use in thatching.

Possible runic inscription in Younger Futhark:ᚦᛅᚴᛁᚦᚱ