As to the meaning of this general type of glyph I will, of course, only be able to give some preliminary remarks:

1. There is a henua at left, bent leftwards, rightwards or being straight. Thin, medium or thick, cut off at one end or not, short, medium or long. The meaning is still fundamentally henua. The different variants should be only more precise definitions.

2. The two parts of GD25 - when separated - are used as markers, so to say, in this kind of glyph and I believe that the sequences of 8 glyphs in the structure we are studying - the majority of them being bent concave to the right - could refer to that part of the year when the Pleiades are visible above (i nika).

The 8 similar glyphs bent concave to the left could then represent that time of the year when the Pleiades are not visible, Matariki i raro. That these are marked, while those in Matariki i nika are not marked, should be due to - I believe - that they show when in this halfyear events are taking place, those events which are being documented. When we are in Matariki i nika the 'seasons' are instead defined by the six balls in Tauono. You can watch the Pleiades to see what time of the year it is.

3. The right part (ragi) is fundamentally the sky. This sky is first of all defined by the henua at left in the glyph (see above). The 'rays' serve as markers complementing the markers of henua at left. Also there are other such markers (different heads, different tea, different 'eyes'), all contributing to defining when, the 'season'.