What term refers to a device such as a blade or plate that moves in the air to catch wind?

The term that refers to a device designed to move through the air and catch the wind is "vane." A vane typically consists of a flat or curved surface that is mounted to swivel or pivot, allowing it to align with wind direction. This function can be seen in weather vanes, which indicate wind direction, or in devices like sailboats that rely on vanes to catch wind for propulsion.

Other options describe similar concepts but have different specific meanings. For example, a blade generally refers to the flat cutting part of an object, often associated with things like knives or propellers, rather than a device that specifically indicates or responds to wind. A fan implies a mechanical device designed to create airflow, involving multiple blades that rotate to push air, but it does not imply a movement governed by wind. A wing, which is also designed for flight, implies a broader structure, typically associated with aircraft, and focuses more on lift rather than just catching wind. Thus, "vane" is the most accurate term for a device that moves to catch the wind.