Sindoor

"[A female figurine from the Indus valley civilization has hair which] is painted black and parted in the middle of the forehead, with traces of red pigment in the part. This form of ornamentation may be the origin of the later Hindu tradition where a married woman wears a Streak of vermilion or powdered cinnabar (sindur) in the part of her hair."

"You should not be taken aback if you find that the practice of applying sindura (vermilion) to the simanta/manga partition of the hair on the head) by Hindu womenfolk is rooted back in the Harappan Civilization itself."