Bill > SRes2

This resolution is a formal procedural document that directs the Secretary of the Senate to notify the House of Representatives that a quorum (the minimum number of members required to be present to conduct official business) of the Senate is assembled and prepared to begin legislative work. In congressional procedure, establishing a quorum is a fundamental step that ensures the legislative body has sufficient members present to legitimately conduct its business and make official decisions. The resolution serves as a standard parliamentary communication between the two chambers of Congress, signaling that the Senate has met its basic organizational requirements and is ready to commence its legislative activities.

https://www.congress.gov/bill/119th-congress/senate-resolution/2/all-info