def METHOD_NAME(verts):
	normal = Vector(0,0,0)
	for i in range(len(verts)):
		x1, y1, z1 = verts[i - 1]
		x2, y2, z2 = verts[i]
		nx = (y1 - y2) * (z1 + z2)
		ny = (z1 - z2) * (x1 + x2)
		nz = (x1 - x2) * (y1 + y2)
		normal += Vector(nx, ny, nz)
	return normal.unit()