From Upper Paleolithic times the tri-lines occur independently on Neolithic seals, figurines and vases in the culture groups of Old Europe. The most expressive renderings of tri-lines are found on friezes ornamenting Cucuteni vases or on the interior of dishes. The tri-line is associated with energy symbols like the Whirl. Associations with the symbolism of "beginning" and "becoming". Cucuteni, NE Romania 3800-3600 B.C.
The Language of the Goddess, Marija Gimbutas Pg. 89-93