Ideas:

1. Probably this glyph is of the same type as that in Hb9-57:

2. According to Fischer the text is destroyed to the right (but not to the left) of this glyph. Barthel could not see the glyph above, but guessed that it had been there once. Furthermore, he guessed that there was not only a 'splendid bird' to the right of this glyph but also a 'rei miro' to the left.

Therefore I believe - as according to Barthel there was room enough for three glyphs (which he could not see) - there might be two glyphs missing to the right of the glyph above. But we don't know if these missing glyphs belong to the week or if they belong to the following text.