Ideas:

1. This type of glyph, I think, is not the same as the somewhat similar 'hiding'-glyph

which is found e.g. in Monday, Wednesday and Friday in the weekly calendar of Large Santiago Tablet.

2. The similarity, though, should be a sign indicating that these two glyphs are similar in meaning. Metoro seems to have made no distinction between them, often saying maunga. Possibly we should see a mountain in this glyph, whereas the glyph with buds for arms (as seen above) is meant to represent a kana rei.

The ancient Egyptians regarded the city of the dead as a mountain and depicted Hathor, the cow, emerging from the side of a mountain as an illustration of emerging life. Could it be that both the 'hiding'-glyph and the glyph above means not only 'hiding' but also a state of (temporary) death? But what then is the difference in meaning between the two types of glyphs? I think one of the glyphs represents a real mountain. But which one?