unnan
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
unnan
AddUnnende indulta, Rtl. 40, 5. III. AddHit becwæð sé þe hit áhte . . . swá swá hit his yldran . . . létan and lǽfdan þám tó gewealde þe hý wel úðon, Ll. Th. i. 184, 3.
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

Abbreviation not recognized. See:

A Combined List of Abbreviations.