The hair in the first link appears to have the opposite meaning of a spiral.
As opposed to the Spiral, which he regards as ‘open and optimistic’, Marcel Brion considers the plait to be a ‘closed and pessimistic’ motif:
The motif of the plait is far more complicated and harder to define. The motif is as widespread as that of the spiral, but it has a very different meaning. This is due, in the first place, to the fact that it is a ‘closed’ motif and hence a pessimistic one, unless, that is, we regard it in the reassuring light of the theory of the Eternal Homecoming, so rich in hope, and of which the plait forms the simplest formulation and the clearest image. Were one to conceive a spiral as long and as entwined as the mind could imagine, it would necessarily end at some point, while the most rudimentary plait is a prison without hope of escape. (Marcel Brion, Lattice points in simple polytopes, p. 198)
The plait may thus regarded as a symbol of involution.
A braid (also called plait) is a complex structure or pattern formed by intertwining three or more strands of flexible material such as textile fibers, wire, or human hair. Compared to the process of weaving a wide sheet of cloth from two separate, perpendicular groups of strands (warp and weft), a braid is usually long and narrow, with each component strand functionally equivalent in zigzagging forward through the overlapping mass of the others.
The simplest possible braid is a flat, solid three-strand structure. More complex braids can be constructed from an arbitrary (but usually odd) number of strands to create a wider range of structures: wider ribbon-like bands, hollow or solid cylindrical cords, or broad mats which resemble a rudimentary perpendicular weave.
Braids are commonly used to make rope, decorative objects, and hairstyles (see pigtails). Complex braids have been used to create hanging fiber artworks.