ís
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
§7,
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
ís
AddOn ðǽm mere wæs micel ís and yfel . . . þá on forewearde niht snáð ís ðára háligra líchoman, Shrn. 61, 35-62, 2. Þá wæs Donua seó eá swá swíþe oferfroren þæt hié getrúwedon þæt hié ofer þǽm íse faran mehten; ac hié mǽst ealle þǽr forwurdon, Ors. 4, 11; S. 208, 2.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.