According to the company’s official website, the lid of this model has a capital “R” surrounded by a circle.

This symbol indicates that the trademark has been registered with the relevant trademark registration agency and is protected by law. In STIHL products, the circled "R" is usually used to indicate that the trademark has been registered and is a legally protected trademark.

It should be noted that different regions and countries may have different regulations and standards for trademark registration and the use of trademark symbols, so you should abide by local laws, regulations and norms when using trademark symbols. If you have specific questions about trademark registration and the use of trademark symbols, it is recommended that you consult a professional trademark registration agency or lawyer.