Congressional Legislation 101 – Types Of Measures Ammoland Inc. Posted on U S Capital Building Congress United States – -(AmmoLand.com)- With the 117th Congress in session, there will be a flurry of legislation introduced. But what exactly does an introduced measure do? What do those combinations of letters and numbers in front of a bill mean? For starters, any Senator or Representative can introduce a piece of legislation. For the most part, they will be numbered in the order received – a bill with a lower number was introduced earlier in the Congress than one with a higher number. But different items of legislation do different things. Here’s a quick rundown of the four types of legislation that you will most often see discussed: