When poled, PVDF is a ferroelectric polymer, exhibiting efficient piezoelectric and pyroelectric properties. Periodically poled crystals are frequently used as nonlinear optical materials. A sneakbox is a small boat that can be sailed, rowed, poled or sculled. Chalupa boats are normally rowed or poled, and less commonly motorized. Not all piezoelectric materials can be poled. It can also be poled or paddled, but is too wide for efficient paddling. The original ferries were poled across the river. Hence, these crystals are called periodically poled. The copper is pressurised by the air, then oxidised, and finally poled. They had to be poled against the current and sometimes pulled from the riverbanks. In most versions, his weapon is a poled golden glaive. These they assembled to be poled up the Colorado. It was then poled back to the ramp by an on-board ride attendant. Typical materials are lithium niobate (LiNbO) and (periodically poled) potassium titanyl phosphate (KTP).