Paddle
tool used for pushing against liquids, either as a form of propulsion in a boat or as an implement for mixing
A paddle is a tool used for pushing against liquids, either for propulsion in a boat or for mixing liquids.

The Duvensee paddle, one of the worlds oldest wooden paddle (Mesolithic around 6.200 B.C.)
Paddles commonly used in canoes consist of a wooden, fibreglass or metal rod (the shaft) with a handle on one end and a rigid sheet (the blade) on the other end. Paddles for use in kayaks are longer, with a blade on each end, and usually no handles.