Allow

To sign allow, take both hands and form open, flat hands facing each other, all fingers held together on each hand, but at diagonal angles so that they aren't parallel, more like angled inward towards your torso at 45 degrees. Sweep both open hands in a curved fashion slightly upward and outward.

The allow sign is signed almost like street, but in a more angled, curved fashion (not parallel and straight, like the latter sign).