See Louvers.

Similar to slats, vanes are used to describe the strips of material that comprise vertical blinds.

Vertical slats or louvers made of plastic or fabric and mounted onto a headrail.

A plastic or synthetic fletching.

Plastic or rubber compound fletchings on an arrow.

See picture ] blades of a fantail.

The scientifically designed and positioned fins that direct or redirect fluid flow inside the torque converter.