Jafnkrappr

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

jafnkrappr

a. as strait, as narrow; í jafnkrappan stað, in such a strait.

Possible runic inscription in Younger Futhark:ᛁᛅᚠᚾᚴᚱᛅᛒᛒᚱ