As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
þeir Old Icelandic word can mean:
- (þær, þau), dem. pron. pl. they, those, answering to the sing. ‘sá, sú, þat’, and ‘hann, hón, þat’;
- 1) the neut. pl. ‘þau’ as collective for a masc. and fem.; síðan gengu þau (sc. Njáll and Bergthora) inn bæði;
- 2) ‘þeir’ is frequently used before an adv., or a prep. with its complement; þeir norðr þar, those there in the north; þeir fyrir austan árnar, those east of the rivers;
- 3) pleonast. before the names of two or more persons; þau Ásgerðr ok Þorsteinn, Asgerd and Thorstein; börn þeira Hildigunnar ok Kára váru þeir Starkaðr ok Flosi, the children of H. and K. were these, S. and F.; þeir feðgar, father and son;
- 4) ellipt., before the name of a single person; þeir Oddr, O. and his men; frá skiptum þeira Þórðar, about the dealings of Thord and Björn; þau Asgerðr, Asgerd and her son (Thorstein).
Possible runic inscription in Younger Futhark:ᚦᛁᛁᚱ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.