As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- m. the king’s key = axe (which opens all doors and chests); munu þeir bera konungslykil at húsinu, they will break in by force.
Possible runic inscription in Younger Futhark:ᚴᚢᚾᚢᚾᚴᛋᛚᚢᚴᛁᛚᛚ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.