Poor means a deficit or diminished quantity or volume of something. Some suggest that a person who is poor in Spirit, is one who admits not to have sufficient embodiment of The Spirit. That person is therefore not pompous, nor do they take The Spirit for granted.
The Uniform Commercial Code (UCC) is very broad set of statutes that governs various business terms, especially with regards to contracts. For instance, it defines several terms, such as the terms merchant, goods, services, and other business words.
The UCC is the Uniform Commercial Code, laws that (with variations from state to state) govern commercial transactions in the U.S. A lien is a security interest. UCC lien is a lien that is perfected (explained below) under the UCC. Last year I blogged about security interests and their perfection.