What is the term for a brief expression of gratitude to the congregation at a Buddhist service?

The term "Words of appreciation" accurately describes a brief expression of gratitude to the congregation at a Buddhist service. In Buddhist practice, it is common to acknowledge the community and express gratitude as part of the spiritual experience. This can reflect an appreciation for the collective effort and support of the congregation, emphasizing the interconnectedness of all participants in the service.

The other options do not capture the same spirit or context associated with Buddhist services. A "Thank you note" suggests a more formal and private expression, which is not typically part of the communal service atmosphere. "Gratitude message" might imply a more expansive communication rather than the succinct expression that is customary in these settings. "Expressive farewell," on the other hand, conveys a sense of departure rather than gratitude, which is not the central focus of acknowledging the congregation during a service. Thus, "Words of appreciation" precisely reflects the customary practice within the context of Buddhist worship.