The answer is a cowlick. A cowlick is a tuft of hair that stands up on its own, most common along the front hairline.
It's different from a whorl, which is hair growing in a circular, swirl pattern (usually at the crown), and from a hair stream, which just describes the general direction hair flows. Vellus hair is unrelated — that's the short, fine, unpigmented hair found elsewhere on the body, not a growth-pattern term at all.
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