1
Two exactly alike glyphs, fairly symmetrical, though with slightly larger half-circles at left.
2 Two exactly alike glyphs, fairly symmetrical, though with slightly larger half-circles at left (= preceding item).
3 At left: Different sizes for the tau, and a little space between them, tau on top slightly displaced towards the right.

At right: Only right side of tau seen.
4 Two exactly alike glyphs. Different sizes for the tau, and a little space between them, tau on top slightly displaced towards the right (= as at left in the preceding item).
5 Two exactly alike glyphs. Different sizes for the tau, and a little space between them, tau on top slightly displaced towards the right (= preceding item).
6 A single glyph with henua occupying the center. The top of this henua is sucked inwards. The bottom tau is not circular.
7 A single glyph with henua occupying the center. The top tau is not circular. The bottom of this henua is sucked inwards. I.e., this glyph is an inversion of the preceding one.