The phrase "bill number" refers to a unique identification number assigned to a proposed law or legislation. It helps to easily track and reference specific bills during the legislative process. Full definition
They identified 129 different bill numbers as the subjects of their lobbying efforts in the last six months of the year. (politico.com)
Unfortunately, it took several searches to get the correct bill number (most results were documents I had already seen that didn't mention the actual vote). (politics.stackexchange.com)
Today's Tip is a caution about searching for federal bill numbers. (slaw.ca)