A simple device used for spinning is a hand spindle, also called -

Explanation: A Takli is a simple hand spindle used for spinning fibers into yarn. It is a traditional tool that consists of a spindle and a whorl, used in hand-spinning methods, especially in rural and traditional settings. The Charkha, on the other hand, is a larger device used for spinning and is often associated with Mahatma Gandhi's promotion of hand-spinning.

Final Answer: is a) Takli.