bana
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.
bana
Add: Used of a weapon with which death is caused Ne wæs ecg bona he was not slain by the edge of the sword, B. 2506. Heardréde hildeméceas tó bonan wurdon falchions were the death of Heardred, 2203. v. flǽsc-, mæsser-, sácerd-, self-bana.
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A Combined List of Abbreviations.

Abbreviation not recognized. See:

A Combined List of Abbreviations.