Dicionário do Programador - Letra U Ubiquitous Language UDF (User-Defined Function) UDP UDP Socket UDT (User-Defined Type) UI Component UI Framework UI Library UI Thread UML Unbuffered I/O Unchecked Exception undefined Underfitting Underflow Undo Log Unhandled Exception Unicast Unicode Union Type Unique Constraint Unique Index Unique Key Unit of Work Unit Test Unit Testing Unix Unix Domain Socket Unix Timestamp Unmanaged Code Unmarshal Unmount Unordered Map Unreachable Code Unsafe Code Unstructured Data Unsupervised Learning Untrusted Input Untyped Language Unzip Upcasting Update Update Lock Update Query Update Statement Upgrade Script Upload Upload Bandwidth Upload Endpoint Upsert Uptime URI URL URL Encoding URL Fragment URL Parameter URL Path URL Query String URL Rewriting URL Router URL Scheme URL Shortener URL Slug URL-safe Base64 Usability Usability Testing Usage Analytics Use Case Use Case Diagram User User Acceptance Testing (UAT) User Experience (UX) User ID User Interface (UI) User Pool User Session User Story User Table User-Agent UTC UTF-16 UTF-32 UTF-8 UUID UX Research