Suggestion:

This type of glyph shows the forepart of a ship mounted on a straight pole. The forepart of a ship is also called the 'stem' (which is similar in meaning to 'pole'). Or it could be called the 'head', the part that goes first, the part with highest status.

The Polynesian obsession with canoes makes it probable that they used the similarity between a canoe and a chief here too. The swiftly moving red morning sun I believe is pictured as vai-ora-a-Tane by way of the glyph

and this glyph might have been constructed as a compound. The four (two in rangi) signs like shark-fins could be seen as flames of a sun. But I have another idea, too, for explanation of which I need a new page.