URI
An abbreviation for "Uniform Resource Identifier" — a combination of symbols that allows precise identification of a certain resource. Resource identifiers must be created in compliance with a specific set of rules and imply the possibility of further extension.
Utility tokens
Utility tokens are a type of cryptocurrency tokens created in order to fund the expansion of a cryptocurrency. They are usually meant to be used later for purchasing of various commodities that the cryptocurrency developer offers.
UTXO
An abbreviation for "Unspent transaction output," digital money, basically, a concept of ownership signatures chain along with the transaction confirming message that designates the change of money ownership.