unary operator:An operator that takes a single operand.
unassemble:To translate binary machine code into the equivalent assembly-language representation. Also called disassemble.
unresolved external:A reference to a global or external variable or function that cannot be found either in the modules being linked or in the libraries linked with those modules. An unresolved reference causes a fatal link error.
user-defined type:A data type defined by the user. See also “structure.”