R

radio button

A member of a group, only one of which can be selected at any time.

reader

A class that reads 8-bit text and delivers Unicode characters.

reference

A variable that exists in accessible memory and accesses an object or array in inaccessible memory.

reference equality

An equality criterion that is true if two references point to the same object.

return value

The value returned by a method.

row major

Specification of row followed by column.