As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- a. trifile, threefold; pl. in distrib. sense, three; þrennar tylftir í fjórðungi hverjum, three twelves in each quarter; þetta eru þrenn verð, three times the price.
Possible runic inscription in Younger Futhark:ᚦᚱᛁᚾᚾᚱ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.