The term "Shaker" can refer to several different meanings depending on context.
1) In a general sense, it could be used as an adjective to describe someone who is full of energy and enthusiasm, always in motion or active. For example, "He's such a shaker - he never stops moving!"
2) It can also refer to a type of furniture with a simple, functional design that was popular during the 18th and 19th centuries. These pieces were typically made by members of the Shaker religious sect who valued simplicity and utility in their craftsmanship.
3) In music, "shaker" is another term for a tambourine or other small handheld percussion instrument that produces a sharp, clicking sound when shaken.
4) Lastly, it can refer to the Shakers, an American religious sect founded in the early 19th century by Ann Lee. The group practiced celibacy and communal ownership of property, and were known for their simple, utilitarian style of architecture and furniture making.