private bill

noun2

1. •
   (UK) A parliamentary bill promoted by an organisation such as a local authority or company in order to obtain powers to do something.
2. •
   (US) An item of legislation for the benefit of a particular individual, not codified with generally applicable laws.

   • The Senate to-day passed upwards of fifty private bills, and the House quite as many. None of them, however, were of much magnitude. — 1860