A Bill starts either in the House of Representatives or in the Senate. Bills that start in the House are designated “H.R.” plus a number. (Note that that stands for House of Representatives, not House Resolution as is often though.) These are bills proposed by congressmen/women and considered first by the House and later by the Senate. Bills can also start in the Senate, when they are proposed by Senators — they get considered by the Senate first and the House after. Those are designated “S.” plus a number. The numbering is done independently, so there is both a H.R. 1 and an S. 1.
