H.R. 1 (short for House of Representatives 1[1]) is an identifier for a bill of the United States House of Representatives. Historically, H.R. 1 indicated the first bill introduced in a given Congress (as the numbering system restarts every two years with each new Congress). However, since the start of the 106th Congress in 1999,[2] each Congress's rules have called for reserving numbers 1 through 10 for assignment by the Speaker of the House.[3] H.R. 1 is thus generally reserved for a major piece of legislation.