Ab7-37 and Ab8-69:

These two glyphs are alike and characterized by the great tail, which serves as a sign. The tail carries the meaning of 'end', i.e. winter solstice (the end of the solar year).

At Ab8-69 Metoro seems to have recognized this, because he said ma te tara tua, i.e. 'and the tara at the back (tu'a)'. The emperor of China sat with his back oriented towards the cold north.

Interestingly, tu'a also means sea urchin, echinus: 'The word must have a germ sense indicating something spinous which will be satisfactorily descriptive of the sea urchin all spines, the prawn with antennae and thin long legs, and in the Maori the shell of Mesodesma spissa  ... tuahaigoigo, tattooing on the back ...'

Ca2-8:

The identical form of this glyph in combination with Metoro's nearly identical choice of words (e tara tua) means that also here the meaning is winter solstice.

Nowhere else in the texts of A, B, C and E does Metoro use the words tara tu'a, and  nowhere else in the mentioned rongorongo texts do we find any GD26 glyph with this tail sign.