Þrennr

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

þrennr

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

Also available in related dictionaries:

This headword also appears in dictionaries of other languages closely related to Old Icelandic.

• Old Norse - Cleasby & Vigfusson Dictionary
• Old Norwegian - Johan Fritzner's Dictionary