This type of glyph is found in all 7 'periods':

Aa7-14 Aa7-20 Aa7-28 Aa7-42 Aa7-53 Aa7-63 Aa7-70
1 2 3 4 5 6 7

Notice that in period no. 2 one of the 'flames' are missing. What really has happened, I believe, is that the crescent behind the head has been dislocated towards the right, reversed. Although the shape of the head too is different, concave now at the right side - has 'changed sex' so to say..

... Atea then became the wife of Rua-tupua-nui, Source of Great Growth, and they became the parents of all the celestial beings, first the shooting stars, then the Moon and the Sun, next the comets, then the multitude of stars and constellations, and finally the bright and dark nebulae. When this tremendous task had been accomplished Atea took a third husband, Fa'a-hotu, Make Fruitful. Then occurred a curious event. Whether Atea had wearied of bringing forth offspring we are not told, but certain it is that Atea and her husband Fa'a-hotu exchanged sexes. Then the [male] eyes of Atea glanced down at those of his wife Hotu and they begat Ru. It was this Ru who explored the whole earth and divided it into north, south, east, and west ...

... Freeman describres the dualistic cosmology of the Pythagorean school (-5th century), embodied in a table of ten pairs of opposites. On one side there was the limited, the odd, the one, the right, the male, the good, motion, light, square and straight. On the other side there was the unlimited, the even, the many, the left, the female, the bad, rest, darkness, oblong and curved ...

Except for the glyph in period no. 2 they are exactly alike.

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